Stockholders' Equity - Treasury Stock (Details) (USD $) Share data in Thousands, unless otherwise specified	0 Months Ended	12 Months Ended		3 Months Ended
	Dec. 05, 2013	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014 Subsequent event
Equity, Class of Treasury Stock [Line Items]
Aggregate authorized amount	$ 200,000,000
Shares repurchased		50	9,157	2,000
Aggregate cost of shares repurchased		800,000	68,500,000	29,500,000
Remaining amount for purchases under the repurchase program		$ 104,500,000	$ 105,200,000	$ 75,000,000