Stockholders' Equity (Details) (USD $)	3 Months Ended				12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2011
Stockholders' Equity Note [Abstract]
Cash dividend payment					$ 87,044,000	$ 0	$ 0
Common stock cash dividend per share	$ 0.0625	$ 0.0625	$ 0.0625	$ 0.0625	$ 0.25	$ 0	$ 0
Stock Repurchase Program, Authorized Amount	1,162,000,000				1,162,000,000			500,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 221,900,000				$ 221,900,000