Stock-Based Compensation (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Option
Weighted-average assumptions used to estimate fair value
Expected term	6 years 3 months	6 years 3 months	6 years 3 months
Expected stock price volatility (as a percent)	47.10%	46.59%	44.24%
Risk-free interest rate (as a percent)	1.88%	1.43%	1.05%
Expected dividend yield (as a percent)	3.82%	4.74%	3.41%
Other disclosures
Weighted-Average Grant-Date Fair Value (in dollars per share)	$ 2.59	$ 2.35	$ 2.74
Unrecognized compensation cost	$ 3.8
Recognition period	2 years 7 months 28 days
Stock Option | Minimum
Weighted-average assumptions used to estimate fair value
Estimated dividend payments (in dollars per share)	$ 0.34
Unvested Shares
Other disclosures
Unrecognized compensation cost	4.6
Recognition period	1 year 11 months 12 days
Number of Shares
Outstanding at the beginning of the period (in shares)	686,045	500,453	419,340
Granted (in shares)	529,426	591,931	332,113
Vested/Issued (in shares)	(342,613)	(297,375)	(143,626)
Forfeited (in shares)	(82,720)	(108,964)	(107,374)
Outstanding at the end of the period (in shares)	790,138	686,045	500,453
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 8.72	$ 10.95	$ 11.42
Granted (in dollars per share)	$ 7.90	$ 8.02	$ 9.91
Vested/Issued (in dollars per share)	$ 8.98	$ 11.01	$ 9.82
Forfeited (in dollars per share)	$ 8.37	$ 8.94	$ 11.09
Outstanding at the end of the period (in dollars per share)	$ 8.10	$ 8.72	$ 10.95
Unvested Shares | 2005 Plan
Other disclosures
Number of equal increments over the first three anniversaries from the date of grant	3
Unvested Shares | 2013 CEO Plan
Other disclosures
Number of equal increments over the first three anniversaries from the date of grant in which a majority of non-vested shares, granted after 2010, vest	3
Restricted Shares | 2013 Plan
Other disclosures
Number of equal increments over the first three anniversaries from the date of grant	3
Performance Shares
Other disclosures
Unrecognized compensation cost	$ 0.8
Recognition period	2 years 1 month 24 days
Number of Shares
Outstanding at the beginning of the period (in shares)	603,674	470,700	239,700	169,600
Granted (in shares)		308,507	333,000	136,000
Forfeited (in shares)		(175,533)	(102,000)	(65,900)
Outstanding at the end of the period (in shares)		603,674	470,700	239,700
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 7.61	$ 8.58	$ 10.25	$ 11.34
Granted (in dollars per share)		$ 7.09	$ 7.76	$ 8.84
Vested/Issued (in dollars per share)		$ 0.00	$ 0.00	$ 0.00
Forfeited (in dollars per share)		$ 9.30	$ 9.84	$ 10.15
Outstanding at the end of the period (in dollars per share)		$ 7.61	$ 8.58	$ 10.25
Performance Shares | 2013 Plan, 2005 Plan and 2013 CEO Plan
Other disclosures
Share Based Compensation Arrangement by Share Based Payment Award, Performance Measurement Period	3 years
Period over which performance goals are measured	3 years
Percentage payout upon change of control	100.00%
Performance Shares | 2013 Plan, 2005 Plan and 2013 CEO Plan | Minimum
Other disclosures
Percentage of award shares to be issued based on performance against goals	0.00%
Performance Shares | 2013 Plan, 2005 Plan and 2013 CEO Plan | Maximum
Other disclosures
Percentage of award shares to be issued based on performance against goals	100.00%