Stock-Based Compensation Stock Option Activity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Fair value assumptions of stock options
Dividend yield	2.00%	2.00%
Risk-free interest rate	2.00%	0.99%
Weighted average expected volatility	20.00%	34.35%
Weighted average expected life	6 years	6 years
Weighted average per share fair value of stock options	$ 3.00	$ 3.80
Summary of Company's Stock Option Activities
Stock Options Shares Outstanding, Beginning balance	8,034,243	8,640,558
Granted, Shares	1,389,452	1,020,979
Exercised, Shares	(754,470)	(642,202)
Forfeited or expired, Shares	(589,238)	(985,092)
Stock Options Shares Outstanding, Ending balance	8,079,987	8,034,243
Options exercisable, shares	5,225,930	4,923,720
Stock Options Outstanding, Weighted Average Exercise Price, Beginning balance	$ 18.37	$ 18.88
Granted, Weighted Average Exercise Price	$ 17.45	$ 14.02
Exercised, Weighted Average Exercise Price	$ 13.74	$ 13.43
Forfeited or expired, Weighted Average Exercise Price	$ 24.36	$ 21.49
Stock Options Outstanding, Weighted Average Exercise Price, Ending balance	$ 18.21	$ 18.37
Options Exercisable, Weighted Average Exercise Price	$ 19.78	$ 21.48
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 1 month	6 years 0 months
Options exercisable, Weighted Average Remaining Contractual Term	4 years 9 months	4 years 7 months
Stock Options Outstanding, Aggregate Intrinsic Value	$ 17,762	$ 20,838
Options exercisable, Aggregate Intrinsic Value	$ 11,624	$ 8,580