Stock-Based Compensation Stock Option Activity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of Company's Stock Option Activities
Stock Options Shares Outstanding, Beginning balance	8,640,558	7,055,274	7,301,458
Granted, Shares	1,020,979	3,060,519	1,624,369
Exercised, Shares	(642,202)	(11,120)	(23,437)
Forfeited or expired, Shares	(985,092)	(1,464,115)	(1,847,116)
Stock Options Shares Outstanding, Ending balance	8,034,243	8,640,558	7,055,274
Options exercisable, shares	4,923,720	4,603,963	4,623,935
Stock Options Outstanding, Weighted Average Exercise Price, Beginning balance	$ 18.88	$ 21.99	$ 24.33
Granted, Weighted Average Exercise Price	$ 14.02	$ 12.97	$ 14.20
Exercised, Weighted Average Exercise Price	$ 13.43	$ 13.16	$ 12.66
Forfeited or expired, Weighted Average Exercise Price	$ 21.49	$ 21.56	$ 24.51
Stock Options Outstanding, Weighted Average Exercise Price, Ending balance	$ 18.37	$ 18.88	$ 21.99
Options Exercisable, Weighted Average Exercise Price	$ 21.48	$ 23.80	$ 26.10
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 0 months	6 years 5 months	5 years 7 months
Options exercisable, Weighted Average Remaining Contractual Term	4 years 7 months	4 years 4 months	4 years 0 months
Stock Options Outstanding, Aggregate Intrinsic Value	$ 20,838	$ 570	$ 27
Options exercisable, Aggregate Intrinsic Value	$ 8,580	$ 43	$ 7