Stock-Based Compensation (Details 3) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Additional information
Calculated fair market value	$ 2,400,000
Accrued compensation	44,093,000	36,892,000
Stock Options
Stock-Based Compensation
Weighted-average fair value per share of options granted (in dollars per share)	$ 5.06	$ 4.03	$ 5.04
Fair value assumptions:
Expected dividend yield (as a percent)	1.82%	1.86%	1.70%
Expected stock price volatility (as a percent)	46.60%	46.50%	44.20%
Risk-free interest rate (as a percent)	0.96%	1.17%	2.24%
Expected term	5 years 7 months 6 days	5 years 3 months 18 days	5 years 3 months 18 days
Other information
Vesting period	3 years
Total fair value of options vested	700,000
Nonvested Options, Shares
Beginning of the period (in shares)	330	333
Granted (in shares)	156
Vested (in shares)	(158)
Forfeited (in shares)	(1)
End of the period (in shares)	330	333
Nonvested Options, Weighted-Average Grant Date Fair Value
Beginning of the period (in dollars per share)	$ 4.40
Granted (in dollars per share)	$ 5.06	$ 4.03	$ 5.04
Vested (in dollars per share)	$ 4.51
Forfeited (in dollars per share)	$ 5.04
End of the period (in dollars per share)	$ 4.66	$ 4.40
Additional information
Compensation expense yet to be recognized	700,000
Weighted-average period over which compensation cost will be recognized	1 year 9 months 18 days
Stock units granted (in shares)	156	190	142
Stock Options | Minimum
Other information
Sum of age and years of service for accelerated vesting on retirement of certain stock options and restricted stock awards	75 years
Restricted Stock and Restricted Stock Units
Shares
Beginning of the period (in shares)	272	302	312
Granted (in shares)	169	224	231
Vested (in shares)	(240)	(254)	(241)
Forfeited (in shares)	(2)
End of the period (in shares)	199	272	302
Additional information
Compensation expense yet to be recognized	1,100,000
Weighted-average period over which compensation cost will be recognized	9 months 18 days
Fair value of shares vested	3,100,000
Weighted-average fair value (in dollars per share)	$ 13.57	$ 10.78	$ 11.29
Aggregate intrinsic value of stock vested	4,700,000	3,100,000	2,600,000
Performance Stock Units
Other information
Vesting period	3 years
Additional information
Compensation expense yet to be recognized	1,500,000
Weighted-average period over which compensation cost will be recognized	1 year 1 month 6 days
Period for which shareholder return is compared with peer group for units determined by EPS performance	3 years
Types of performance units	2
Percentage of units measured on stock price relative to peer group	50.00%
Percentage of units measured on stock price based on pre determined EPS	50.00%
Stock units granted (in shares)			0
Accrued compensation	$ 900,000
Stock units vested during period (in shares)	0
Performance Stock Units | Minimum
Additional information
Performance measures for dollar denominated award granted	0
Performance Stock Units | Maximum
Additional information
Performance measures for dollar denominated award granted	2.0
Restricted Stock | Minimum
Other information
Sum of age and years of service for accelerated vesting on retirement of certain stock options and restricted stock awards	75 years