Shareholders' Equity and Dividends (Details) (USD $)	1 Months Ended		12 Months Ended			0 Months Ended	3 Months Ended	0 Months Ended
	Jan. 31, 2014	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 17, 2014	Mar. 31, 2014	Feb. 26, 2015	Oct. 04, 2013
Common stock, par value (usd per share)			$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)			50,000,000
Preferred stock, shares outstanding (shares)		0	0	0	0
Number of common share equivalents (share)									1
Preferred stock shares designated as Series A junior participating preferred stock									2,000,000
Preferred Stock, par or stated value per share									$ 0.01
Accelerated dividend declared		$ 13,600,000
Accelerated dividend declared (usd per share)		$ 0.20
Dividends declared (usd per share)			$ 4.74	$ 0.2	$ 0.52
Stock repurchase program, period in force	5 years
Stock repurchase program, authorized amount	150,000,000
Dividends, Share-based Compensation, Cash			11,000,000
Cash dividend equivalents paid on share-based payments			3,781,000
Stock repurchased during period, shares			558,171
Stock repurchased during period, value			25,000,000
Share price of stock repurchased (usd per share)			$ 44.79
Special Dividend [Member]
Dividends declared (usd per share)	$ 4.34
Dividends, common stock	300,000,000			300,000,000		300,000,000
Funding of dividend by domestic cash						50,000,000
All Countries [Domain]
Foreign earnings repatriated						250,000,000	250,000,000
Subsequent Event [Member]
Dividends declared (usd per share)								$ 0.10
Dividends, common stock								6,900,000
Series A Junior Participating Preferred Stock [Member]
Preferred share dividend									1
Exercise price of series a junior participating preferred stock									$ 200