CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands		Common Stock [Member]	Treasury Stock	Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Total
Balance at Dec. 31, 2014		$ 218,483	$ (200)	$ 62,839	$ (65,488)	$ 247,042	$ 462,676
Balance (in shares) at Dec. 31, 2014		218,483,000	(200,000)
Increase (Decrease) in Shareholders' Equity
Net Income						$ 152,149	152,149
Pension Liability Adjustment					9,070		9,070
Foreign Currency Translation Adjustments					$ (14,760)		(14,760)
Cash Dividends						$ (91,755)	(91,755)
Common Stock Purchased	[1]	$ (19)				(416)	(435)
Common Stock Purchased (in shares)	[1]	(19,000)
Stock Compensation		$ 597		11,731		(218)	12,110
Stock Compensation (in shares)		597,000
Employee Stock Buybacks and Common Stock Options Exercised		$ (308)		(6,754)		$ 90	(6,972)
Employee Stock Buybacks and Common Stock Options Exercised (in shares)		(308,000)
Excess Tax Benefit on Restricted Stock, Dividend Compensation and Non-Qualified Stock Options				1,946			1,946
Balance at Dec. 31, 2015		$ 218,753	$ (200)	69,762	$ (71,178)	$ 306,892	524,029
Balance (in shares) at Dec. 31, 2015		218,753,000	(200,000)
Increase (Decrease) in Shareholders' Equity
Net Income						$ 31,928	31,928
Foreign Currency Translation Adjustments					$ 9,892		9,892
Cash Dividends						$ (21,855)	(21,855)
Common Stock Purchased	[1]	$ (54)				$ (1,289)	$ (1,343)
Common Stock Purchased (in shares)	[1]	(54,000)					54,000
Common Stock Retired		$ (200)	$ 200
Common Stock Retired (in shares)		(200,000)	200,000
Stock Compensation		$ 482		2,843			$ 3,325
Stock Compensation (in shares)		482,000
Employee Stock Buybacks and Common Stock Options Exercised		$ (283)		(7,153)			(7,436)
Employee Stock Buybacks and Common Stock Options Exercised (in shares)		(283,000)
Excess Tax Benefit on Restricted Stock, Dividend Compensation and Non-Qualified Stock Options				3,019			3,019
Balance at Mar. 31, 2016		$ 218,698		$ 68,471	$ (61,286)	$ 315,676	$ 541,559
Balance (in shares) at Mar. 31, 2016		218,698,000

[1] Charges to Retained Earnings are from purchases of the Company's Common Stock.