Stockholders' Equity (Details) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended
	Nov. 08, 2012	Jul. 24, 2013	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Dividends, Common Stock [Abstract]
Cash dividends declared per common share (in dollars per share)	$ 0.0375		$ 0.0375	$ 0.0000	$ 0.1875
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Amount remaining under stock repurchase authorization				$ 100,000,000
Amount of stock repurchase authorization		100,000,000
Debt Conversion, Converted Instrument, Shares Issued				77.18004
Incremental Common Shares Attributable to Conversion of Debt Securities				38,600,000	38,600,000
Accelerated Dividend [Member]
Dividends, Common Stock [Abstract]
Cash dividends declared per common share (in dollars per share)	$ 0.15
2% convertible senior notes [Member]
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Principal amount				$ 1,000
Debt Instrument, Convertible, Conversion Price				$ 12.96