Treasury And Common Stock - Schedule Of Treasury Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013 Excluding Long-Term Incentive Plan [Member]	Mar. 31, 2014 Long-Term Incentive Plan [Member]	Dec. 31, 2013 Long-Term Incentive Plan [Member]
Class of Stock [Line Items]
Treasury Stock, Beginning Balance, Amount	$ (452,040)		$ (441,774)			$ 452,040
Treasury stock purchases	(83)	[1]	(10,025)	[1]	(9,961)	(83)	(305)
Treasury Stock, Ending Balance, Amount	$ (452,123)						$ 452,040
Treasury Stock, Shares, Beginning Balance	10,557,342		9,944,239			10,557,342
Treasury stock purchased in connection with long-term incentive plan, Shares					594,582	8,953	18,521
Treasury Stock, Shares, Ending Balance	10,566,295						10,557,342

[1] This includes shares withheld in order to satisfy employee withholding taxes upon the distribution of vested restricted stock units.