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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Revenues $ 146,185 $ 141,924 $ 406,476 $ 392,400
Operating expenses:        
Cost of operations 99,656 98,228 286,225 281,850
General and administration 17,448 17,211 52,324 49,192
Depreciation and amortization 16,385 15,787 46,374 46,562
Divestiture transactions     (5,611) 7,455
Development project charge       1,394
Severance and reorganization costs       430
Environmental remediation charge   75   75
Expense from divestiture, acquisition and financing costs       24
Gain on settlement of acquisition related contingent consideration       (1,058)
Total operating expenses 133,489 131,301 379,312 385,924
Operating income 12,696 10,623 27,164 6,476
Other expense (income):        
Interest income (56) (84) (267) (279)
Interest expense 10,087 9,524 30,363 28,718
Loss on debt extinguishment 345   866  
Loss (gain) on derivative instruments 41 (82) 239 366
Income from equity method investments       (90)
Loss on sale of equity method investment       221
Other income (178) (204) (387) (772)
Other expense (income), net 10,239 9,154 30,814 28,164
Income (loss) before income taxes 2,457 1,469 (3,650) (21,688)
Provision for income taxes 198 229 1,112 1,060
Net income (loss) 2,259 1,240 (4,762) (22,748)
Less: Net (loss) income attributable to noncontrolling interests (37) 160 1,189 (3,750)
Net income (loss) attributable to common stockholders $ 2,296 $ 1,080 $ (5,951) $ (18,998)
Basic earnings per share attributable to common stockholders:        
Weighted average common shares outstanding 40,810 40,313 40,560 40,074
Basic earnings per common share $ 0.06 $ 0.03 $ (0.15) $ (0.47)
Diluted earnings per share attributable to common stockholders:        
Weighted average common shares outstanding 41,283 40,581 40,560 40,074
Diluted earnings per common share $ 0.06 $ 0.03 $ (0.15) $ (0.47)