CONSOLIDATED STATEMENTS OF EQUITY - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]	Stock Options [Member]	Former Affiliated Entity [Member] Common Stock [Member]	Former Affiliated Entity [Member] Additional Paid-in Capital [Member]	Former Affiliated Entity [Member] Treasury Stock [Member]	Former Affiliated Entity [Member] Stock Options [Member]
Beginning Balances at Dec. 31, 2012	$ 533,547,000	$ 36,947,000	$ 407,206,000	$ (35,762,000)	$ 121,097,000	$ 4,059,000
Beginning Balances, Shares at Dec. 31, 2012		36,946,603		2,327,623
Net income	35,061,000				29,321,000	5,740,000
Distributions to noncontrolling interest	(7,269,000)					(7,269,000)
Contributions from noncontrolling interest	3,022,000					3,022,000
Issuances of restricted stock, Shares				7,298
Issuances of restricted stock, Value	2,871,000		2,721,000	$ 150,000
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments	17,058,000
TEU issuance proceeds, net of issuance costs - 6,000,000 units	120,335,000
Issuances from exercises of stock options, net of swaps, Shares		0		53,611				0		136,253
Issuances from exercises of stock options, net of swaps, Value	683,000	$ 0	66,000	$ 617,000				$ 0	$ (515,000)	$ 1,938,000	$ 1,423,000
Shares withheld for payroll taxes, Shares				(59,219)
Shares withheld for payroll taxes, Value	(1,137,000)		(8,000)	$ (1,129,000)
Forfeitures of restricted stock, Shares				(9,986)
Forfeitures of restricted stock, Value	0		10,000	$ (10,000)
Share-based compensation	9,911,000		9,911,000
Tax benefit from exercise of restricted stock units and stock options and vested restricted stock	(108,000)		(108,000)
Ending Balances at Dec. 31, 2013	715,397,000	$ 36,947,000	556,676,000	$ (34,196,000)	150,418,000	5,552,000
Ending Balances, Shares at Dec. 31, 2013		36,946,603		2,199,666
Net income	17,088,000				16,583,000	505,000
Distributions to noncontrolling interest	(4,171,000)					(4,171,000)
Contributions from noncontrolling interest	2,585,000					2,585,000
Dissolution of noncontrolling interests	1,342,000					1,342,000
Purchase of noncontrolling interests, net	(6,242,000)		(2,969,000)			(3,273,000)
Issuances of common stock, Shares		0		164,914
Issuances of common stock, Value	0	$ 0	(2,567,000)	$ 2,567,000
Issuances from exercises of stock options, net of swaps, Shares				45,062				0		60,823
Issuances from exercises of stock options, net of swaps, Value	$ 329,000		(333,000)	$ 662,000				$ 0	(43,000)	$ 920,000	877,000
Shares withheld for payroll taxes, Shares	(55,238)			(55,238)
Shares withheld for payroll taxes, Value	$ (1,043,000)		(4,000)	$ (1,039,000)
Shares repurchased, Shares	(1,491,187)			(1,491,187)
Shares repurchased, Value	$ (24,595,000)			$ (24,595,000)
Forfeitures of restricted stock, Shares				(9,986)
Forfeitures of restricted stock, Value	0		10,000	$ (10,000)
Share-based compensation	8,033,000		8,033,000
Tax benefit from exercise of restricted stock units and stock options and vested restricted stock	142,000		142,000
Ending Balances at Dec. 31, 2014	709,742,000	$ 36,947,000	558,945,000	$ (55,691,000)	167,001,000	2,540,000
Ending Balances, Shares at Dec. 31, 2014		36,946,603		3,485,278
Net income	(212,371,000)				(213,047,000)	676,000
Distributions to noncontrolling interest	(701,000)					(701,000)
Issuances of common stock, Shares				335,611
Issuances of common stock, Value	$ 0		(5,362,000)	$ 5,362,000
Issuances from exercises of stock options, net of swaps, Shares							0			3,999
Issuances from exercises of stock options, net of swaps, Value									$ (33,000)	$ 64,000	$ 31,000
Shares withheld for payroll taxes, Shares	(51,521)			(51,521)
Shares withheld for payroll taxes, Value	$ (762,000)		(1,000)	$ (761,000)
Forfeitures of restricted stock, Shares				(6,579)
Forfeitures of restricted stock, Value	0		125,000	$ (125,000)
Share-based compensation	8,576,000		8,576,000
Tax benefit from exercise of restricted stock units and stock options and vested restricted stock	(400,000)		(400,000)
Ending Balances at Dec. 31, 2015	$ 504,115,000	$ 36,947,000	$ 561,850,000	$ (51,151,000)	$ (46,046,000)	$ 2,515,000
Ending Balances, Shares at Dec. 31, 2015		36,946,603		3,203,768