Stock-Based Compensation Restricted Stock Units Summary (Details) (Restricted Stock Units (RSUs) [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
[Line Items]
Outstanding, beginning balance, Number	774,000		625,000		588,000
Granted, Number	255,000		464,000		355,000	[1]
Granted, Weighted Average Grant Date Fair Value	$ 42.51		$ 47.21		$ 54.71	[1]
Forfeited, Number	(40,000)		(40,000)		(47,000)
Outstanding, ending balance, Number	658,000		774,000		625,000
Vested and Released [Member]
[Line Items]
Issued, Number	(331,000)		(275,000)		(271,000)
Released, Aggregate Intrinsic Value	$ 17,983	[2]	$ 16,855	[2]	$ 20,413	[2]
Vested but Not Released [Member]
[Line Items]
Issued, Number	(8,000)
Vested but not released, Aggregate Intrinsic Value	324	[2]
Expected to Vest [Member]
[Line Items]
Outstanding, ending balance, Number	589,000
Expected to vest, Aggregate Intrinsic Value	$ 24,391	[2]

[1] These restricted stock units include 61,500 shares for the 2011 awards under the Performance Award Agreement, which are eligible for vesting at December 31, 2011.

[2] The aggregate intrinsic value is the market value of the stock, before applicable income taxes, based on the closing price on the stock release dates or at the end of the period for restricted stock units expected to vest.