Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Amounts charged against income, before income tax benefit	$ 4,274		$ 5,807		$ 4,055
Amount of related income tax benefit recognized in income	(1,714)		(2,326)		(1,656)
Total net income impact	$ 2,560		$ 3,481		$ 2,399
Weighted Average Exercise Price Per Share [Abstract]
Options Outstanding, Vested (shares)	1,766,262	[1]
Long Term Incentive Plan | Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested Awards Outstanding (shares)	264,655		244,246		351,998
Granted Awards Outstanding (shares)	216,586	[2]	184,610	[2]	30,000	[2]
Vested Awards Outstanding (shares)	(249,205)	[3]	(157,318)	[3]	(116,202)	[3]
Forfeited Awards Outstanding (shares)			(6,883)		(21,550)
Non-vested Awards Outstanding (shares)	232,036		264,655		244,246
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant Date Fair Value, Per Share, Non-Vested, Oustanding (USD per share)	$ 12.64		$ 16.65		$ 18.26
Weighted Average Grant Date Fair Value Per Share, Granted (USD per share)	$ 13.21	[2]	$ 9.46	[2]	$ 5.51	[2]
Weighted Average Grant Date Fair Value Per Share, Vested (USD per share)	$ 13.58	[3]	$ 15.24	[3]	$ 18.26	[3]
Weighted Average Grant Date Fair Value Per Share, Forfeited (USD per share)			$ 10.43		$ 18.49
Weighted Average Grant Date Fair Value, Per Share, Non-Vested, Oustanding (USD per share)	$ 12.15		$ 12.64		$ 16.65
Long Term Incentive Plan | Stock Options
Weighted Average Exercise Price Per Share [Abstract]
Options, Outstanding, Weighted Average Remaining Contractual Term	7 years 4 months 24 days
Long Term Incentive Plan | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Options, outstanding [Abstract]
Options Outstanding (shares)	1,399,123		1,129,829		947,737
Options, Granted (shares)	462,374	[4]	368,016	[4]	347,880	[4]
Options, Exercised (shares)	(51,050)	[5]	(18,750)		(14,212)
Options, Forfeited (shares)	(2,005)		(41,893)		(87,783)
Options, Expired (shares)	(33,597)		(38,079)		(63,793)
Options Outstanding (shares)	1,774,845		1,399,123		1,129,829
Weighted Average Exercise Price Per Share [Abstract]
Weighted Average Exercise Price, Per Share, Oustanding (USD per share)	$ 16.74		$ 18.95		$ 24.29
Weighted Average Exercise Price, Per Share, Granted (USD per share)	$ 13.31	[4]	$ 9.37	[4]	$ 4.82	[4]
Weighted Average Exercise Price, Per Share, Exercised (USD per share)	$ 6.28	[5]	$ 4.63		$ 4.51
Weighted Average Exercise Price, Per Share, Forfeited (USD per share)	$ 4.31		$ 11.95		$ 19.32
Weighted Average Exercise Price, Per Share, Expired (USD per share)	$ 23.65		$ 22.29		$ 23.96
Weighted Average Exercise Price, Per Share, Outstanding (USD per share)	$ 16.03		$ 16.74		$ 18.95
Options, Exercisable, (shares)	1,198,318	[6]
Weighted Average Exercise Price, Per Share, Exercisable (USD per share)	$ 18.31	[6]
Options, Exercisable, Weighted Average Remaining Contractual Term	6 years 9 months 18 days	[6]
Weighted Average Exercise Price, Per Share, Vested and Expected to Vest (USD per share)	$ 16.04	[1]
Options, Vested and Expected to Vest, Weighted Average Remaining Contractual Term	7 years 3 months 18 days	[1]

[1] Based upon a fair market value of the common stock as of December 31, 2014 of $14.21 per share, the stock options that have vested and are expected to vest have an aggregate intrinsic value (equal to the value of in-the-money stock options above their respective exercise price) of $4.3 million.

[2] he grant date fair value per share of the restricted stock awards under the Long Term Incentive Plan is calculated as the fair market value per share of the common stock on the date of grant. During the years ended December 31, 2014, 2013 and 2012, the weighted average grant date fair value of restricted stock awards granted was $2.9 million, $1.7 million, and $0.2 million, respectively

[3] ased upon the respective grant date fair value, the aggregate fair value of restricted stock which vested during the year ended December 31, 2014, 2013 and 2012 was $3.4 million, $2.4 million and $2.1 million, respectively.

[4] During the years ended December 31, 2014, 2013 and 2012, the weighted average grant date fair value of stock options granted was $3.2 million, $1.5 million and $0.7 million, respectively. For purposes of determining compensation expense, the grant date fair value per share of the stock options was estimated using the Black-Scholes option pricing model which requires the use of various assumptions including the expected life of the option, expected dividend rate, expected volatility and risk-free interest rate. Key assumptions used for determining the fair value of stock options granted were as follows: Years Ended December 31, 2014 2013 2012 Expected life (1)5.5 - 6.5 years 5.5 - 6 years 5.75 - 6 yearsExpected dividend (2)— — —Expected volatility (3)51% 45% 45%Risk-free interest rate (4)1.63% - 2.19% 0.77% - 1.92% 0.82% - 1.21%

[5] During the years ended December 31, 2014 and 2013, the total intrinsic value of stock options that were exercised was $0.4 mill

[6] Based upon a fair market value of the common stock as of December 31, 2014 of $14.21 per share, the stock options that are exercisable have an aggregate intrinsic value (equal to the value of in-the-money stock options above their respective exercise price) of $2.6 million.