Quarterly report pursuant to Section 13 or 15(d)

Business Segment Information (Details)

v3.3.0.814
Business Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Revenues $ 189,142 $ 168,891 $ 457,064 $ 412,180
Interest income   12 162 36
Interest expense 1,359 1,361 3,894 3,308
Depreciation and amortization of intangible assets 5,501 5,452 15,947 15,465
Income (loss) before taxes, excluding unallocated corporate activity 13,764 13,603 23,812 23,075
Operating Segments | U.S. Regions        
Segment Reporting Information [Line Items]        
Revenues 105,163 79,217 225,643 180,863
Interest income   0 0 0
Interest expense 0 0 0 0
Depreciation and amortization of intangible assets 223 330 715 977
Income (loss) before taxes, excluding unallocated corporate activity 9,955 7,468 17,203 12,746
Operating Segments | U.S. Federal        
Segment Reporting Information [Line Items]        
Revenues 35,491 27,600 90,071 66,257
Interest income   0 0 0
Interest expense 0 0 0 0
Depreciation and amortization of intangible assets 299 315 907 879
Income (loss) before taxes, excluding unallocated corporate activity 4,331 4,953 12,633 8,542
Operating Segments | Canada        
Segment Reporting Information [Line Items]        
Revenues 12,931 21,776 37,663 57,843
Interest income   0 3 1
Interest expense 369 355 980 1,025
Depreciation and amortization of intangible assets 278 390 803 1,210
Income (loss) before taxes, excluding unallocated corporate activity (1,660) (289) (7,238) (3,336)
Operating Segments | Small-Scale Infrastructure        
Segment Reporting Information [Line Items]        
Revenues 14,681 13,954 42,059 39,309
Interest income   11 159 34
Interest expense 990 1,006 2,914 2,283
Depreciation and amortization of intangible assets 3,678 3,204 10,469 9,451
Income (loss) before taxes, excluding unallocated corporate activity 2,992 1,372 6,619 5,187
Operating Segments | Other        
Segment Reporting Information [Line Items]        
Revenues 20,876 26,344 61,628 67,908
Interest income   1 0 1
Interest expense 0 0 0 0
Depreciation and amortization of intangible assets 1,023 1,213 3,053 2,948
Income (loss) before taxes, excluding unallocated corporate activity (1,854) 99 (5,405) (64)
Consolidation, Eliminations        
Segment Reporting Information [Line Items]        
Unallocated corporate activity (6,243) (6,844) (19,644) (21,847)
Consolidation, Eliminations | U.S. Regions        
Segment Reporting Information [Line Items]        
Unallocated corporate activity 0 0 0 0
Consolidation, Eliminations | U.S. Federal        
Segment Reporting Information [Line Items]        
Unallocated corporate activity 0 0 0 0
Consolidation, Eliminations | Canada        
Segment Reporting Information [Line Items]        
Unallocated corporate activity 0 0 0 0
Consolidation, Eliminations | Small-Scale Infrastructure        
Segment Reporting Information [Line Items]        
Unallocated corporate activity 0 0 0 0
Consolidation, Eliminations | Other        
Segment Reporting Information [Line Items]        
Unallocated corporate activity $ 0 $ 0 $ 0 $ 0