Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Shares	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Non-Controlling Interest
Balance at Beginning of Period at Dec. 31, 2018	$ 160,900	$ 1,148	$ 57,438	$ 156,130	$ (5,456)	$ (52,501)	$ 4,141
Stock based-awards	11,096		7,646			3,450
Repurchase of common shares	(487)					(487)
Dividends paid	(24,374)			(24,374)
Amortization of deferred pension costs, net of tax	(7)				(7)
Interest rate swaps, net of tax	(332)				(332)
Net income (loss)	40,557			40,510			47
Balance at End of Period at Mar. 31, 2019	$ 187,353	1,148	65,084	172,266	(5,795)	(49,538)	4,188
Cash Dividends per Share	$ 0.55
Balance at Beginning of Period at Dec. 31, 2019	$ 182,140	1,148	51,872	160,539	(6,330)	(29,364)	4,275
Stock based-awards	10,530		9,110			1,420
Repurchase of common shares	(1,238)					(1,238)
Dividends paid	(11,111)			(11,111)
Interest rate swaps, net of tax	(1,909)				(1,909)
Net income (loss)	(108,338)			(108,421)			83
Balance at End of Period at Mar. 31, 2020	$ 70,074	$ 1,148	$ 60,982	$ 41,007	$ (8,239)	$ (29,182)	$ 4,358
Cash Dividends per Share	$ 0.25