CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]
Beginning Balances at Dec. 31, 2011	$ 511,212	$ 36,836	$ 398,517	$ (33,982)	$ 108,155	$ 1,686
Beginning Balances, Shares at Dec. 31, 2011		36,835,732		(2,212,876)
Net income	17,876				12,942	4,934
Distributions to noncontrolling interest	(3,694)					(3,694)
Contributions from noncontrolling interest	1,133					1,133
Issuances of common stock, Shares		18,469
Issuances of common stock, Value	0	19	(19)
Issuances of restricted stock, Shares				27,934
Issuances of restricted stock, Value	300		(129)	429
Issuances from exercises of stock options, net of swaps, Shares		92,402		11,372
Issuances from exercises of stock options, net of swaps, Value	1,159	92	899	168
Shares withheld for payroll taxes, Shares				(59,603)
Shares withheld for payroll taxes, Value	(968)			(968)
Shares repurchased, Shares				(94,450)
Shares repurchased, Value	(1,409)			(1,409)
Share-based compensation	7,572		7,572
Tax benefit from exercise of restricted stock units and stock options and vested restricted stock	366		366
Ending Balances at Dec. 31, 2012	533,547	36,947	407,206	(35,762)	121,097	4,059
Ending Balances, Shares at Dec. 31, 2012		36,946,603		(2,327,623)
Net income	35,061				29,321	5,740
Distributions to noncontrolling interest	(7,269)					(7,269)
Contributions from noncontrolling interest	3,022					3,022
Issuances of restricted stock, Shares				7,298
Issuances of restricted stock, Value	2,871		2,721	150
Convertible note issuance proceeds, net of issuance costs and taxes	17,058		17,058
TEU issuance proceeds, net of issuance costs - 6,000,000 units	120,335		120,335
Issuances from exercises of stock options, net of swaps, Shares				189,864
Issuances from exercises of stock options, net of swaps, Value	2,106		(449)	2,555
Shares withheld for payroll taxes, Shares	(59,219)			(59,219)
Shares withheld for payroll taxes, Value	(1,137)		(8)	(1,129)
Forfeitures of restricted stock, Shares				(9,986)
Forfeitures of restricted stock, Value	0		10	(10)
Share-based compensation	9,911		9,911
Tax benefit from exercise of restricted stock units and stock options and vested restricted stock	(108)		(108)
Ending Balances at Dec. 31, 2013	715,397	36,947	556,676	(34,196)	150,418	5,552
Ending Balances, Shares at Dec. 31, 2013		36,946,603		(2,199,666)
Net income	17,088				16,583	505
Distributions to noncontrolling interest	(4,171)					(4,171)
Noncontrolling Interest, Increase from Business Combination	(2,585)					(2,585)
Dissolution of noncontrolling interests	1,342					1,342
Purchase of noncontrolling interests, net	(6,242)		(2,969)			(3,273)
Issuances of common stock, Shares				164,914
Issuances of common stock, Value	0		(2,567)	2,567
Issuances from exercises of stock options, net of swaps, Shares				105,885
Issuances from exercises of stock options, net of swaps, Value	1,206		(376)	1,582
Shares withheld for payroll taxes, Shares	(55,238)			(55,238)
Shares withheld for payroll taxes, Value	(1,043)		(4)	(1,039)
Shares repurchased, Shares	(1,491,187)			(1,491,187)
Shares repurchased, Value	(24,595)			(24,595)
Forfeitures of restricted stock, Shares				(9,986)
Forfeitures of restricted stock, Value	0		10	(10)
Share-based compensation	8,033		8,033
Tax benefit from exercise of restricted stock units and stock options and vested restricted stock	142		142
Ending Balances at Dec. 31, 2014	$ 709,742	$ 36,947	$ 558,945	$ (55,691)	$ 167,001	$ 2,540
Ending Balances, Shares at Dec. 31, 2014		36,946,603		(3,485,278)