Consolidated Statement of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Common shares, outstanding shares, start at Dec. 31, 2015		44,350,002				1,974,097
Common shares, outstanding, start at Dec. 31, 2015	$ (23,699)	$ 1,142	$ 0	$ 219,207	$ (10,538)	$ (238,875)	$ 5,365
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation, net of awards issued	22,079		(197)			$ 22,276
Stock-based compensation, net of awards issued, shares						(141,106)
Tax benefit of stock-based awards issued	(1,162)		(1,162)
Repurchases of common shares, shares						62,000
Repurchases of common shares	(7,161)					$ (7,161)
Dividends paid	$ (95,145)			(95,145)
Issuance of common shares, shares	1,696,250	1,696,250
Issuance of common shares	$ 197,202	$ 38	197,164
Cancellation of treasury shares, shares		(1,250,000)				(1,250,000)
Cancellation of treasury shares	0	$ (32)	(142,955)			$ (142,987)
Non-controlling interest dividend	(1,386)						(1,386)
Other comprehensive income	710				710
Net income (loss)	63,859			63,895			(36)
Common shares, outstanding shares, end at Dec. 31, 2016		44,796,252.000				644,991.000
Common shares, outstanding, end at Dec. 31, 2016	155,297	$ 1,148	52,850	187,957	(9,828)	$ (80,773)	3,943
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation, net of awards issued	22,942		1,529			$ 21,413
Stock-based compensation, net of awards issued, shares						(191,513)
Repurchases of common shares, shares						158,569
Repurchases of common shares	(16,909)					$ (16,909)
Dividends paid	(97,143)			(97,143)
Issuance of common shares	0
Non-controlling interest dividend	(26)						(26)
Other comprehensive income	1,475				1,475
Net income (loss)	$ 83,096			83,125			(29)
Common shares, outstanding shares, end at Dec. 31, 2017	44,184,205	44,796,252				612,047
Common shares, outstanding, end at Dec. 31, 2017	$ 148,732	$ 1,148	54,463	173,855	(8,353)	$ (76,269)	3,888
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation, net of awards issued	34,194		2,975			$ 31,219
Stock-based compensation, net of awards issued, shares						(218,625)
Repurchases of common shares, shares						85,985
Repurchases of common shares	(7,451)					$ (7,451)
Dividends paid	(97,251)			(97,251)
Issuance of common shares	0
Non-controlling interest dividend	(10)						(10)
Other comprehensive income	2,897				2,897
Net income (loss)	$ 79,789			79,526			263
Common shares, outstanding shares, end at Dec. 31, 2018	44,316,845	44,796,252				479,407
Common shares, outstanding, end at Dec. 31, 2018	$ 160,900	$ 1,148	$ 57,438	$ 156,130	$ (5,456)	$ (52,501)	$ 4,141