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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information [Line Items]        
Revenues $ 162,628 $ 152,489 $ 296,404 $ 267,922
Interest income 13 11 24 162
Interest expense 1,760 1,258 3,234 2,535
Depreciation and amortization of intangible assets 5,528 5,219 10,949 10,446
Income (loss) before taxes, excluding unallocated corporate activity 9,705 10,634 18,377 10,052
Operating Segments | U.S. Regions        
Segment Reporting Information [Line Items]        
Revenues 70,583 71,594 112,204 118,028
Interest income 0 0 0 0
Interest expense 0 0 0 0
Depreciation and amortization of intangible assets 137 204 274 409
Income (loss) before taxes, excluding unallocated corporate activity 4,623 6,158 4,814 8,075
Operating Segments | U.S. Federal        
Segment Reporting Information [Line Items]        
Revenues 43,099 30,437 81,768 54,580
Interest income 3 0 5 0
Interest expense 289 0 388 0
Depreciation and amortization of intangible assets 704 302 1,227 608
Income (loss) before taxes, excluding unallocated corporate activity 4,565 5,042 10,965 8,300
Operating Segments | Canada        
Segment Reporting Information [Line Items]        
Bad debt expense 1,934      
Revenues 13,198 13,837 28,005 24,732
Interest income 0 2 0 3
Interest expense 403 282 750 611
Depreciation and amortization of intangible assets 261 282 500 525
Income (loss) before taxes, excluding unallocated corporate activity (1,844) (570) (1,303) (5,578)
Operating Segments | Small-Scale Infrastructure        
Segment Reporting Information [Line Items]        
Revenues 19,060 16,319 39,753 29,922
Interest income 10 9 19 159
Interest expense 1,068 976 2,096 1,924
Depreciation and amortization of intangible assets 3,751 3,414 7,600 6,880
Income (loss) before taxes, excluding unallocated corporate activity 2,290 2,112 4,611 2,349
Operating Segments | Other        
Segment Reporting Information [Line Items]        
Revenues 16,688 20,302 34,674 40,660
Interest income 0 0 0 0
Interest expense 0 0 0 0
Depreciation and amortization of intangible assets 675 1,017 1,348 2,024
Income (loss) before taxes, excluding unallocated corporate activity 71 (2,108) (710) (3,094)
Unallocated corporate activity        
Segment Reporting Information [Line Items]        
Unallocated corporate activity (6,839) (6,897) (14,566) (13,405)
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