Quarterly report pursuant to Section 13 or 15(d)

Business Segment Information (Details)

v3.5.0.2
Business Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Revenues $ 180,598 $ 189,142 $ 477,002 $ 457,064
Interest income 12 0 36 162
Interest expense 1,887 1,359 5,121 3,894
Depreciation and amortization of intangible assets 5,802 5,501 16,751 15,947
Income (loss) before taxes, excluding unallocated corporate activity 18,153 13,756 36,530 23,808
Customer Who Declared Bankruptcy        
Segment Reporting Information [Line Items]        
Unallocated corporate activity (2,194)   (3,195)  
Operating Segments | U.S. Regions        
Segment Reporting Information [Line Items]        
Revenues 83,652 103,847 195,856 221,875
Interest income 0 0 0 0
Interest expense 0 0 0 0
Depreciation and amortization of intangible assets 116 213 390 622
Income (loss) before taxes, excluding unallocated corporate activity 7,918 10,581 12,732 18,656
Operating Segments | U.S. Federal        
Segment Reporting Information [Line Items]        
Revenues 46,498 35,491 128,266 90,071
Interest income 2 0 7 0
Interest expense 278 0 666 0
Depreciation and amortization of intangible assets 686 299 1,913 907
Income (loss) before taxes, excluding unallocated corporate activity 5,338 4,332 16,303 12,632
Operating Segments | Canada        
Segment Reporting Information [Line Items]        
Bad debt expense     1,934  
Revenues 12,018 12,931 40,023 37,663
Interest income 0 0 0 3
Interest expense 493 369 1,243 980
Depreciation and amortization of intangible assets 288 278 788 803
Income (loss) before taxes, excluding unallocated corporate activity (154) (1,660) (1,457) (7,238)
Operating Segments | Small-Scale Infrastructure        
Segment Reporting Information [Line Items]        
Revenues 21,790 16,025 61,543 45,947
Interest income 10 0 29 159
Interest expense 1,116 990 3,212 2,914
Depreciation and amortization of intangible assets 4,063 3,691 11,663 10,571
Income (loss) before taxes, excluding unallocated corporate activity 5,312 2,204 9,923 4,553
Operating Segments | Other        
Segment Reporting Information [Line Items]        
Revenues 16,640 20,848 51,314 61,508
Interest income 0 0 0 0
Interest expense 0 0 0 0
Depreciation and amortization of intangible assets 649 1,020 1,997 3,044
Income (loss) before taxes, excluding unallocated corporate activity (261) (1,701) (971) (4,795)
Unallocated corporate activity        
Segment Reporting Information [Line Items]        
Unallocated corporate activity (10,478) (6,235) (25,044) (19,640)
Unallocated corporate activity | U.S. Regions        
Segment Reporting Information [Line Items]        
Unallocated corporate activity 0 0 0 0
Unallocated corporate activity | U.S. Federal        
Segment Reporting Information [Line Items]        
Unallocated corporate activity 0 0 0 0
Unallocated corporate activity | Canada        
Segment Reporting Information [Line Items]        
Unallocated corporate activity 0 0 0 0
Unallocated corporate activity | Small-Scale Infrastructure        
Segment Reporting Information [Line Items]        
Unallocated corporate activity 0 0 0 0
Unallocated corporate activity | Other        
Segment Reporting Information [Line Items]        
Unallocated corporate activity $ 0 $ 0 $ 0 $ 0