Consolidated Statements of Changes in Equity (USD $) In Thousands, except Share data	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Noncontrolling Interest - Non-redeemable	Non-Controlling Interest - Redeemable	Net Income (Loss)
Beginning balances at Dec. 31, 2009	$ 221,560	$ 179	$ (3,513)	$ 86,310	$ 138,196	$ 388	$ 13,823
Beginning balances, shares at Dec. 31, 2009		20,967,418	2,976,733
Net income (loss)	50,583				48,759	1,824	13,963	64,546
Transfer of noncontrolling interest	684					684	(684)
Acquired noncontrolling interest	612					612	338
Noncontrolling interest distributions	(1,761)					(1,761)	(13,905)
Purchase of additional controlling interest	(1,914)			(1,914)
Stock issued for acquisitions	1,550	2		1,548
Stock issued for acquisitions, shares		50,150
Stock option exercise	91			91
Stock option exercise, shares		4,000
Stock based compensation expense	3,742			3,742
Issuance of vested restricted stock		130,211
Treasury shares redeemed to pay income tax	(940)		(940)
Treasury shares redeemed to pay income tax, shares			31,531
Excess tax benefits - vesting nonvested stock	459			459
Issuance of common stock under Employee Stock Purchase Plan	781			781
Issuance of common stock under Employee Stock Purchase Plan, shares		28,508
Recording noncontrolling interest in joint venture at redemption value	41				41
Ending balances at Dec. 31, 2010	275,488	181	(4,453)	91,017	186,996	1,747	13,535
Ending balances, shares at Dec. 31, 2010		21,180,286	3,008,264
Net income (loss)	(12,169)				(13,244)	1,075	8,518	(3,651)
Transfer of noncontrolling interest	368			205		163
Acquired noncontrolling interest	1,372					1,372
Noncontrolling interest distributions	(1,402)					(1,402)	(10,455)
Purchase of additional controlling interest	(641)			(641)			(250)
Sale of noncontrolling interest	308			212		96
Stock based compensation expense	4,092			4,092
Issuance of vested restricted stock		155,687
Treasury shares redeemed to pay income tax	(1,186)		(1,186)
Treasury shares redeemed to pay income tax, shares			43,182
Repurchase of common stock	(577)		(577)
Repurchase of common stock, shares	24,159		24,159
Excess tax benefits - vesting nonvested stock	221			221
Issuance of common stock under Employee Stock Purchase Plan	860	2		858
Issuance of common stock under Employee Stock Purchase Plan, shares		38,291
Ending balances at Dec. 31, 2011	266,734	183	(6,216)	95,964	173,752	3,051	11,348
Ending balances, shares at Dec. 31, 2011		21,374,264	3,075,605
Net income (loss)	28,035				27,440	595	7,393	35,428
Acquired noncontrolling interest	1,636					1,636
Noncontrolling interest distributions	(1,249)					(1,249)	(7,195)
Purchase of additional controlling interest	(189)			(189)			(120)
Sale of noncontrolling interest	80			80
Stock option exercise, shares
Stock based compensation expense	4,390			4,390
Issuance of vested restricted stock		154,323
Treasury shares redeemed to pay income tax	(672)		(672)
Treasury shares redeemed to pay income tax, shares			36,621
Repurchase of common stock	(26,958)		(26,958)
Repurchase of common stock, shares	1,540,813		1,540,813
Excess tax benefits - vesting nonvested stock	(376)			(376)
Issuance of common stock under Employee Stock Purchase Plan	783	1		782
Issuance of common stock under Employee Stock Purchase Plan, shares		50,185
Reclassification of common stock at par value		32		(32)
Ending balances at Dec. 31, 2012	$ 272,214	$ 216	$ (33,846)	$ 100,619	$ 201,192	$ 4,033	$ 11,426
Ending balances, shares at Dec. 31, 2012		21,578,772	4,653,039