Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Series D convertible preferred stock	Common Stock	Preferred Stock Series D convertible preferred stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total Attributed To Stockholders	Total Attributed To Stockholders Series D convertible preferred stock	Non- controlling Interests
Beginning Balance (in shares) at Dec. 31, 2015			8,398,944	0				1,214,144
Beginning Balance at Dec. 31, 2015	$ 509,457		$ 96	$ 0	$ 1,140,875	$ (472,614)	$ (1,034)	$ (157,699)	$ 509,624		$ (167)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	12,363					12,363			12,363		0
Net unrealized gain (loss) on securities available-for-sale	160						160		160
Foreign currency translation adjustments	99						99		99
Cash dividends declared	(3,850)				(3,850)				(3,850)
Repurchases of common shares	(15,000)							$ (15,000)	(15,000)
Repurchases of common shares (in shares)			(176,204)					(176,204)
Issuance of common shares related to employee stock transactions (in shares)			37,091
Issuance of common shares related to employee stock transactions	375		$ 1		374				375
Taxes paid on stock-based compensation	(1,001)				(1,001)				(1,001)
Stock-based compensation	4,029				4,029				4,029
Tax deficiencies from stock-based compensation	(1,246)				(1,246)				(1,246)
Ending Balance (in shares) at Mar. 31, 2016			8,259,831					1,390,348
Ending Balance at Mar. 31, 2016	505,386		$ 97		1,139,181	(460,251)	(775)	$ (172,699)	505,553		(167)
Beginning Balance at Dec. 31, 2015	73,864
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Net income (loss)	(493)
Activity of noncontrolling interests, net	(32,946)
Ending Balance at Mar. 31, 2016	40,425
Beginning Balance (in shares) at Dec. 31, 2016			5,889,013	0				3,230,045
Beginning Balance at Dec. 31, 2016	321,673		$ 91	$ 0	1,090,331	(424,279)	(224)	$ (344,246)	321,673		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment for adoption of ASU 2016-09	1,052					1,052			1,052
Net income (loss)	13,027					13,027			13,027		0
Net unrealized gain (loss) on securities available-for-sale	88						88		88
Foreign currency translation adjustments	0						0		0
Issuance of stock, net of offering costs (in shares)			1,046,500	1,150,000
Issuance of stock, net of offering costs	109,320	$ 110,837	$ 10	$ 110,837	109,310				109,320	$ 110,837
Dividends	(2,084)				(2,084)				(2,084)
Cash dividends declared	(3,322)				(3,322)				(3,322)
Issuance of common shares related to employee stock transactions (in shares)			53,631
Issuance of common shares related to employee stock transactions	86		$ 1		85				86
Taxes paid on stock-based compensation	(2,464)				(2,464)				(2,464)
Stock-based compensation	4,175				4,175				4,175
Ending Balance (in shares) at Mar. 31, 2017			6,989,144	1,150,000				3,230,045
Ending Balance at Mar. 31, 2017	552,388		$ 102	$ 110,837	$ 1,196,031	(410,200)	$ (136)	$ (344,246)	552,388		0
Beginning Balance at Dec. 31, 2016	37,266
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Net income (loss)	718
Activity of noncontrolling interests, net	6,992					$ 0			$ 0		$ 0
Ending Balance at Mar. 31, 2017	$ 44,976