Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock [Member]	Total Attributed To Shareholders [Member]	Noncontrolling Interest [Member]
Balance (in shares) at Dec. 31, 2013		9,105,521				350,000
Balance at Dec. 31, 2013	$ 492,868	$ 95	$ 1,135,644	$ (605,221)	$ (150)	$ (37,438)	$ 492,930	$ (62)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	97,572			97,700			97,700	(128)
Net unrealized gain on securities available-for-sale	124				124		124
Foreign currency translation adjustment	(216)				(216)		(216)
Activity of noncontrolling interests, net	(18,508)
Cash dividends declared	(12,451)		(12,451)				(12,451)
Repurchase of common shares (in shares)		225,441				225,441
Repurchase of common shares	(40,261)					$ (40,261)	(40,261)
Issuance of common shares related to employee stock transactions (in shares)		95,753
Issuance of common shares related to employee stock transactions	1,417	$ 1	1,416				1,417
Taxes paid on stock-based compensation	(9,512)		(9,512)				(9,512)
Stock-based compensation	9,006		9,006				9,006
Excess tax benefits (tax deficiencies) from stock-based compensation	24,805		24,805				24,805
Balance (in shares) at Dec. 31, 2014		8,975,833				575,441
Balance at Dec. 31, 2014	563,352	$ 96	1,148,908	(507,521)	(242)	$ (77,699)	563,542	(190)
Balance at Dec. 31, 2013	42,186
Increase (Decrease) in Redeemable Noncontrolling Interest [Roll Forward]
Net income	(607)
Activity of noncontrolling interests, net	(18,508)
Balance at Dec. 31, 2014	23,071
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	34,930			35,106			35,106	(176)
Net unrealized gain on securities available-for-sale	(358)				(358)		(358)
Foreign currency translation adjustment	(434)				(434)		(434)
Activity of noncontrolling interests, net	55,052			(199)			(199)	199
Cash dividends declared	(16,009)		(16,009)				(16,009)
Repurchase of common shares (in shares)		638,703				638,703
Repurchase of common shares	(80,000)					$ (80,000)	(80,000)
Issuance of common shares related to employee stock transactions (in shares)		61,814
Issuance of common shares related to employee stock transactions	842		842				842
Taxes paid on stock-based compensation	(5,080)		(5,080)				(5,080)
Stock-based compensation	11,116		11,116				11,116
Excess tax benefits (tax deficiencies) from stock-based compensation	1,098		1,098				1,098
Balance (in shares) at Dec. 31, 2015		8,398,944				1,214,144
Balance at Dec. 31, 2015	509,457	$ 96	1,140,875	(472,614)	(1,034)	$ (157,699)	509,624	(167)
Increase (Decrease) in Redeemable Noncontrolling Interest [Roll Forward]
Net income	(4,259)
Activity of noncontrolling interests, net	55,052			(199)			(199)	199
Balance at Dec. 31, 2015	73,864
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	48,502			48,502			48,502	0
Net unrealized gain on securities available-for-sale	241				241		241
Foreign currency translation adjustment	569				569		569
Activity of noncontrolling interests, net	(36,859)			(167)			(167)	167
Cash dividends declared	$ (13,015)		(13,015)				(13,015)
Repurchase of common shares (in shares)	2,572,417	2,572,417				2,015,901
Repurchase of common shares	$ (233,757)	$ (6)	(47,204)			$ (186,547)	(233,757)
Issuance of common shares related to employee stock transactions (in shares)		62,486
Issuance of common shares related to employee stock transactions	1,055	$ 1	1,054				1,055
Taxes paid on stock-based compensation	(1,530)		(1,530)				(1,530)
Stock-based compensation	11,449		11,449				11,449
Excess tax benefits (tax deficiencies) from stock-based compensation	(1,298)		(1,298)				(1,298)
Balance (in shares) at Dec. 31, 2016		5,889,013				3,230,045
Balance at Dec. 31, 2016	321,673	$ 91	$ 1,090,331	(424,279)	$ (224)	$ (344,246)	321,673	0
Increase (Decrease) in Redeemable Noncontrolling Interest [Roll Forward]
Net income	261
Activity of noncontrolling interests, net	(36,859)			$ (167)			$ (167)	$ 167
Balance at Dec. 31, 2016	$ 37,266