Share-Based Compensation - Narrative (Details Textual) (USD $)	0 Months Ended		12 Months Ended			1 Months Ended					9 Months Ended
	Jan. 24, 2014	Oct. 25, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2012	Jan. 31, 2012	Mar. 31, 2014	Sep. 30, 2014	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Useful Life of the 2007 plan			10 years
Minimum number of shares of common stock available for grant			1,700,000
Additional number of shares of common stock available for grant			1,500,000
Shares Available for Grant			889,254
Share-based compensation before income tax benefit			$ 2,930,000	$ 5,221,000	$ 7,232,000
Repurchase of Common Stock for Employee Tax Withholding Obligations amount, shares			72,996	50,156	56,885
Repurchase of Common Stock for Employee Tax Withholding Obligations amount			1,800,000	1,300,000	1,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			0	0	0
Liability awards recorded				5,900,000
Weighted-average exercised			$ 17.82	$ 19.79	$ 22.03							$ 23.32
Options Exercised			66,076	59,543	12,099
Capitalized share-based compensation costs			0	0	0
Dividends declared per common share (USD per share)	$ 1.50	$ 2.50	$ 1.90	$ 2.90	$ 0.28
Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation before income tax benefit			0	107,000	593,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			0
Restricted Stock (RSU)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Payments To Employees						200,000	300,000	300,000
Grant date fair value of restricted stock vested			$ 24.87
PBRS
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number			0	0	0							416
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value			$ 0.00	$ 0.00								$ 15.36
Grant date fair value of restricted stock vested				6,000
Payments To Employees									35,000
PUP award cancelled			0	0	0
PUP awards, Granted			0	0	0
PUP award vested			0	0	416
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value			$ 0.00		$ 15.36
Grant date fair value of restricted stock vested			$ 0.00	$ 0.00	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value			$ 0.00	$ 0.00	$ 0.00
Performance unit incentive plan (PUP)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation before income tax benefit			359,000	1,864,000	2,922,000
Payments To Employees				0	0					2,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period											3 years
Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number			328,602	430,899	516,351							572,022
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value			$ 23.30	$ 22.78	$ 21.25							$ 20.36
Grant date fair value of restricted stock vested			4,500,000	3,500,000	4,000,000
Unamortized cost			3,100,000
Recognition Period of Unrecognized cost			1 year 2 months 12 days
PUP award cancelled			33,326	20,432	4,150
PUP awards, Granted			128,700	101,300	168,050
PUP award vested			197,671	166,320	219,571
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value			$ 22.51	$ 20.83	$ 18.26
Grant date fair value of restricted stock vested			$ 23.79	$ 27.27	$ 20.46
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value			$ 23.13	$ 22.13	$ 24.80
Restricted Stock | Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Restricted Stock Units and Performance Based Restricted Stock Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation before income tax benefit			76,000	177,000	450,000
Liabilities related to restricted stock			540,000	664,000
Restructuring Charges
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation before income tax benefit			(137,000)	676,000	253,000
Restructuring Charges | Performance unit incentive plan (PUP)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation before income tax benefit			100,000	329,000	94,000
Performance unit incentive plan (PUP)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Liability awards recorded			$ 3,500,000
PUP award vested			0	0