Quarterly report pursuant to Section 13 or 15(d)

Business Segment Information (Details)

v3.7.0.1
Business Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Revenues $ 134,610 $ 133,776
Interest income 19 12
Interest expense 1,848 1,474
Depreciation and amortization of intangible assets 5,747 5,421
Income (loss) before taxes, excluding unallocated corporate activity 4,497 8,672
Operating Segments | U.S. Regions    
Segment Reporting Information [Line Items]    
Revenues 41,606 41,621
Interest income 0 0
Interest expense 0 0
Depreciation and amortization of intangible assets 74 137
Income (loss) before taxes, excluding unallocated corporate activity (2,581) 191
Operating Segments | U.S. Federal    
Segment Reporting Information [Line Items]    
Revenues 47,924 38,669
Interest income 6 2
Interest expense 267 99
Depreciation and amortization of intangible assets 653 523
Income (loss) before taxes, excluding unallocated corporate activity 5,445 6,400
Operating Segments | Canada    
Segment Reporting Information [Line Items]    
Revenues 9,501 14,807
Interest income 1 0
Interest expense 447 347
Depreciation and amortization of intangible assets 289 239
Income (loss) before taxes, excluding unallocated corporate activity (513) 541
Operating Segments | Small-Scale Infrastructure    
Segment Reporting Information [Line Items]    
Revenues 18,528 20,693
Interest income 12 9
Interest expense 1,122 1,028
Depreciation and amortization of intangible assets 4,253 3,849
Income (loss) before taxes, excluding unallocated corporate activity 1,249 2,321
Operating Segments | Other    
Segment Reporting Information [Line Items]    
Revenues 17,051 17,986
Interest income 0 1
Interest expense 12 0
Depreciation and amortization of intangible assets 478 673
Income (loss) before taxes, excluding unallocated corporate activity 897 (781)
Unallocated corporate activity    
Segment Reporting Information [Line Items]    
Unallocated corporate activity (6,886) (7,727)
Unallocated corporate activity | U.S. Regions    
Segment Reporting Information [Line Items]    
Unallocated corporate activity 0 0
Unallocated corporate activity | U.S. Federal    
Segment Reporting Information [Line Items]    
Unallocated corporate activity 0 0
Unallocated corporate activity | Canada    
Segment Reporting Information [Line Items]    
Unallocated corporate activity 0 0
Unallocated corporate activity | Small-Scale Infrastructure    
Segment Reporting Information [Line Items]    
Unallocated corporate activity 0 0
Unallocated corporate activity | Other    
Segment Reporting Information [Line Items]    
Unallocated corporate activity $ 0 $ 0