Condensed Consolidated Statements of Redeemable Preferred Stock and Equity (Unaudited) - USD ($) $ in Thousands	Total	Redeemable Preferred Stock	Common Stock	Common Stock - Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interest
Beginning Balance at Dec. 31, 2013	$ 594,070	$ 3,963	$ 4	$ 359,818	$ 238,134	$ 0	$ (3,886)	$ 0
Beginning Balance, shares at Dec. 31, 2013		143,313	36,506,221
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	582			582
Issuance of common stock, shares			49,662
Conversion of Series B Preferred Stock and restricted stock units to common stock	23	$ (23)		23
Conversion of Series B Preferred Stock and restricted stock units to common stock, Shares		(816)	(1,634)
Preferred stock redemption	378	$ (3,940)			378
Preferred stock redemption, shares		(142,497)
Issuance of common stock in acquisition (net of issuance costs of $884)	60,196			60,196
Conversion of restricted stock units to common stock	0
Conversion of restricted stock units to common stock, shares			24,906
Convertible notes conversion feature (net of taxes of $5,082 and net of issuance cost of $881)	19,068			19,068
Purchase of capped call transactions	(11,904)			(11,904)
Purchase of remaining interest in VIE (net of taxes of $300)	(524)			(524)
Issuance of common stock in acquisition, shares			5,724,172
Stock compensation expense	4,041			4,041
Series B Preferred Stock dividends paid	(40)				(40)
Net change in unrealized losses on marketable securities	(18)					(18)
Foreign currency translation adjustment	0
Net income (loss)	13,220				13,220
Ending Balance at Sep. 30, 2014	679,092	$ 0	$ 4	431,300	251,692	(18)	(3,886)	0
Ending Balance, Shares at Sep. 30, 2014		0	42,306,595
Beginning Balance at Dec. 31, 2014	778,662	$ 0	$ 4	453,109	321,083	(11)	(4,412)	8,889
Beginning Balance, shares at Dec. 31, 2014		0	44,422,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	15,722			15,722
Issuance of common stock, shares			1,712,966
Conversion of restricted stock units to common stock	(616)						(616)
Conversion of restricted stock units to common stock, shares			178,156
Treasury stock purchases	$ (19,313)						(19,313)
Treasury stock purchases, shares	(66,933)		(2,030,722)
Acquisitions of noncontrolling interests	$ (4,416)							(4,416)
Stock compensation expense	3,427			3,427
Net change in unrealized losses on marketable securities	(1)					(1)
Foreign currency translation adjustment	(4,346)					(3,723)		(623)
Net income (loss)	(56,138)				(55,783)			(355)
Other	350			350
Ending Balance at Sep. 30, 2015	$ 713,331	$ 0	$ 4	$ 472,608	$ 265,300	$ (3,735)	$ (24,341)	$ 3,495
Ending Balance, Shares at Sep. 30, 2015		0	44,283,281