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SCHEDULE II Condensed Financial Information of the Registrant - Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 09, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]        
Net change in cash due to operating activities   $ 79,148 $ (27,914) $ 5,744
Cash flows from investing activities:        
Cash paid for business acquisitions, net of cash acquired   (66,346) 39,726 (146,026)
Other, net   (518) 0 0
Cash used in investing activities:   (140,218) (18,914) (148,902)
Cash flows from financing activities:        
Proceeds from long-term obligations   56,058 54,042 374,815
Principal payments on long-term obligations   (22,252) (19,287) (148,664)
Proceeds from sale of common stock, net $ 54,700 0 53,975 6,000
Proceeds from sale of preferred stock, net   0 14,033 40,050
Purchase of noncontrolling interest   (239,941) (54,598) (33,034)
Other, net   (4,220) (5,687) (1,626)
Proceeds from the exercise of warrants and stock options   8 0 24,348
Payment of fees on restructuring of debt   0 0 (12,333)
Other, net   (44) 0 0
Cash provided by financing activities:   18,788 102,693 244,140
Net change in cash and cash equivalents   (43,253) 50,646 98,981
Cash and cash equivalents, beginning of period   158,624 107,978 8,997
Cash and cash equivalents, end of period   115,371 158,624 107,978
Parent Company        
Condensed Cash Flow Statements, Captions [Line Items]        
Net change in cash due to operating activities   (21,231) (31,601) (30,012)
Cash flows from investing activities:        
Contributions to subsidiaries   (22,428) (62,356) (175,119)
Return of capital from subsidiaries   31,112 0 31,645
Cash paid for business acquisitions, net of cash acquired   0 0 (78,750)
Other, net   (164) (400) 0
Cash used in investing activities:   8,520 (62,756) (222,224)
Cash flows from financing activities:        
Proceeds from long-term obligations   0 50,250 330,000
Principal payments on long-term obligations   0 0 (80,000)
Proceeds from sale of common stock, net   0 53,975 6,000
Proceeds from sale of preferred stock, net   0 14,033 40,050
Purchase of noncontrolling interest   (1,348) 0 (38,403)
Payment of fees on restructuring of debt   0 5,000 0
Other, net   (4,220) (4,066) 0
Proceeds from the exercise of warrants and stock options   8 0 24,348
Payment of fees on restructuring of debt   0 0 (12,333)
Other, net   (1,086) (1,298) (47)
Cash provided by financing activities:   (6,646) 117,894 269,615
Net change in cash and cash equivalents   (19,357) 23,537 17,379
Cash and cash equivalents, beginning of period   41,079 17,542 163
Cash and cash equivalents, end of period   $ 21,722 $ 41,079 $ 17,542