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Condended Financial Information of Registrant Statements of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating expenses                      
Depreciation and amortization                 $ 45,989 $ 31,617 $ 19,918
General and administrative expense (excluding depreciation)                 46,078 42,073 44,271
Acquisition and integration expense                 395 5,294 2,006
Total operating expenses                 2,349,108 1,881,539 2,004,823
Operating income (loss) $ 21,602 $ 26,716 $ 16,451 $ 29,189 $ 28,325 $ (21,784) $ (3,313) $ (19,719) 93,958 (16,494) 61,514
Other income (expense)                      
Interest expense and financing costs, net                 (31,632) (28,506) (20,156)
Loss on termination of financing agreements                 (8,633) 0 (19,669)
Other income (expense), net                 914 (98) (291)
Change in value of common stock warrants                 (1,674) 2,962 (3,664)
Equity earnings (losses) of subsidiaries                 18,369 (22,381) (55,983)
Total other income (expense), net                 (22,656) (37,253) (118,213)
Income (loss) before income taxes                 71,302 (53,747) (56,699)
Income tax benefit                 1,319 7,912 16,788
Net income (loss) $ 19,005 $ 18,824 $ 7,006 $ 27,786 $ 13,687 $ (27,761) $ (13,088) $ (18,673) 72,621 (45,835) (39,911)
Parent Company                      
Operating expenses                      
Depreciation and amortization                 2,871 2,205 962
General and administrative expense (excluding depreciation)                 18,922 15,618 16,558
Acquisition and integration expense                 192 4,781 1,776
Total operating expenses                 21,985 22,604 19,297
Operating income (loss)                 (21,985) (22,604) (19,297)
Other income (expense)                      
Interest expense and financing costs, net                 (13,709) (18,246) (13,028)
Loss on termination of financing agreements                 (1,804) 0 0
Interest income from subsidiaries                 0 583 1,000
Other income (expense), net                 631 67 215
Change in value of common stock warrants                 (1,674) 2,962 (3,644)
Equity earnings (losses) of subsidiaries                 111,162 (17,170) (5,137)
Total other income (expense), net                 94,606 (31,804) (20,614)
Income (loss) before income taxes                 72,621 (54,408) (39,911)
Income tax benefit                 0 8,573 0
Net income (loss)                 $ 72,621 $ (45,835) $ (39,911)