Supplemental Guarantor Information (Supplemental Condensed Consolidated Statement Of Cash Flows) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by/(used in) operating activities	$ (39,886)	$ (33,329)
Net cash used in investing activities	(5,835)	(3,935)
Financing activities
Borrowings under revolving credit facilities	75,000	90,000
Payments on revolving credit facilities	(270,000)	(65,000)
Proceeds from issuance senior notes	523,000
Principal payments on notes payable	(2,541)	(3,042)
Debt issuance costs	(3,593)
Repurchases of common stock under our stock repurchase program		(2,393)
Repurchases of common stock upon vesting of restricted stock awards	(3,693)	(904)
Net proceeds from mortgage repurchase facility	10,551
Net proceeds from issuances of common stock	24,333
Net cash provided by financing activities	353,057	18,661
Net decrease in cash and cash equivalents	307,336	(18,603)
Cash and cash equivalents, Beginning of period	29,450	29,287
Cash and cash equivalents, End of period	336,786	10,684
Elimination Entries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash used in investing activities	44,447	22,895
Financing activities
Payments from (and advances to) parent/subsidiary	(44,447)	(22,895)
Net cash provided by financing activities	(44,447)	(22,895)
CCS [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by/(used in) operating activities	(856)	(10,020)
Net cash used in investing activities	(45,267)	(23,108)
Financing activities
Borrowings under revolving credit facilities	75,000	90,000
Payments on revolving credit facilities	(270,000)	(65,000)
Proceeds from issuance senior notes	523,000
Principal payments on notes payable		(24)
Debt issuance costs	(3,593)
Repurchases of common stock under our stock repurchase program		(2,393)
Repurchases of common stock upon vesting of restricted stock awards	(3,693)	(904)
Net proceeds from issuances of common stock	24,333
Net cash provided by financing activities	345,047	21,679
Net decrease in cash and cash equivalents	298,924	(11,449)
Cash and cash equivalents, Beginning of period	14,637	22,002
Cash and cash equivalents, End of period	313,561	10,553
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by/(used in) operating activities	(27,369)	(23,309)
Net cash used in investing activities	(4,690)	(3,722)
Financing activities
Principal payments on notes payable	(2,541)	(3,018)
Payments from (and advances to) parent/subsidiary	43,045	22,895
Net cash provided by financing activities	40,504	19,877
Net decrease in cash and cash equivalents	8,445	(7,154)
Cash and cash equivalents, Beginning of period	8,646	7,285
Cash and cash equivalents, End of period	17,091	$ 131
Non Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by/(used in) operating activities	(11,661)
Net cash used in investing activities	(325)
Financing activities
Payments from (and advances to) parent/subsidiary	1,402
Net proceeds from mortgage repurchase facility	10,551
Net cash provided by financing activities	11,953
Net decrease in cash and cash equivalents	(33)
Cash and cash equivalents, Beginning of period	6,167
Cash and cash equivalents, End of period	$ 6,134