Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 169,389
Stock options exercised	0
Stock based-awards	5,279
Tax benefit of stock-based awards issued	329
Repurchase of common shares	(46,811)
Dividends paid	(22,491)
Cancellation of common shares	0
Amortization of deferred pension costs, net of tax	86
Net income (loss)	61,153	56,732
Ending balance	166,934
Common Shares [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,203
Stock options exercised	0
Stock based-awards	0
Tax benefit of stock-based awards issued	0
Repurchase of common shares	0
Dividends paid	0
Cancellation of common shares	0
Amortization of deferred pension costs, net of tax	0
Net income (loss)	0
Ending balance	1,203
Additional Paid-In Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0
Stock options exercised
Stock based-awards	2,628
Tax benefit of stock-based awards issued	329
Repurchase of common shares	0
Dividends paid	0
Cancellation of common shares	0
Amortization of deferred pension costs, net of tax	0
Net income (loss)	0
Ending balance	2,957
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	415,930
Stock options exercised	0
Stock based-awards	0
Tax benefit of stock-based awards issued	0
Repurchase of common shares	0
Dividends paid	(22,491)
Cancellation of common shares	0
Amortization of deferred pension costs, net of tax	0
Net income (loss)	61,064
Ending balance	454,503
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(8,626)
Stock options exercised	0
Stock based-awards	0
Tax benefit of stock-based awards issued	0
Repurchase of common shares	0
Dividends paid	0
Cancellation of common shares	0
Amortization of deferred pension costs, net of tax	86
Net income (loss)	0
Ending balance	(8,540)
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(245,184)
Stock options exercised
Stock based-awards	2,651
Tax benefit of stock-based awards issued	0
Repurchase of common shares	(46,811)
Dividends paid	0
Cancellation of common shares	0
Amortization of deferred pension costs, net of tax	0
Net income (loss)	0
Ending balance	(289,344)
Non-Controlling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	6,066
Stock options exercised	0
Stock based-awards	0
Tax benefit of stock-based awards issued	0
Repurchase of common shares	0
Dividends paid	0
Cancellation of common shares	0
Amortization of deferred pension costs, net of tax	0
Net income (loss)	89
Ending balance	$ 6,155