Share-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 2,392	$ 636	$ 3,544
Unrecognized Compensation Cost	10,118
Unrecognized compensation cost not expected to be recognized	6,485
Expiration date of 2007 Stock Incentive Plan	May 20, 2024
Outstanding:
Balance (in shares)	109,000	109,000	384,000
Beginning Balance, weighted average exercise price (in dollars per share)	$ 15.24	$ 15.24	$ 15.40
Granted (in shares)	0	0	0
Granted, weighted average exercise price (in dollars per share)	$ 0	$ 0	$ 0
Exercised (in shares)	(4,337)	0	(22,095)
Exercised, weighted average exercise price (in dollars per share)	$ 11.62	$ 0	$ 7.89
Cancelled or forfeited (in shares)	0	0	(253,000)
Cancelled or forfeited, weighted average exercise price (in dollars per share)	$ 0	$ 0	$ 16.12
Balance (in shares)	105,000	109,000	109,000
Ending balance, weighted average exercise price (in dollars per share)	$ 15.38	$ 15.24	$ 15.24
Vested and expected to vest (in shares)	105,000	109,000	109,000
Exercisable (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	105,000	109,000	79,000
Weighted-average remaining contractual life of all exercisable options (in years)	2 years 3 months 29 days
Stock price per share (in dollars per share)	$ 14.15
Share-based compensation arrangement by share-based payment award, options, exercisable, intrinsic value	35
Intrinsic value under share based compensation scheme	18	0	110
Unvested:
Balance (in shares)	0	30,000	61,000
Granted (in shares)	0	0	0
Vested (in shares)	0	(30,000)	(31,000)
Balance (in shares)	0	0	30,000
Beginning balance, weighted average exercise price of unvested options (in dollars)	$ 0	$ 10.14	$ 9.96
Granted, weighted average Grant-date fair value (in dollars per share)	$ 0	$ 0	$ 0
Vested, weighted average Grant-date fair value (in dollars per share)	$ 0	$ 10.14	$ 9.79
Ending balance, weighted average exercise price of unvested options (in dollars per share)	$ 0	$ 0	$ 10.14
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, number of options (in shares)	105,000
Options outstanding, weighted average remaining contractual life (in years)	2 years 3 months 29 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 15.38
$12.90 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, number of options (in shares)	28,000
Options outstanding, weighted average remaining contractual life (in years)	2 years 1 month 28 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 12.90
$16.29 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, number of options (in shares)	77,000
Options outstanding, weighted average remaining contractual life (in years)	2 years 4 months 20 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 16.29
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	0	18	73
Unrecognized Compensation Cost	0
Weighted Average Remaining Amortization Periods (in years)	0 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	2,261	510	3,378
Unrecognized Compensation Cost	10,118
Weighted Average Remaining Amortization Periods (in years)	0 years 10 months 24 days
Exercisable (in shares)
Expected to vest	649,000	570,000	1,040,000
Outstanding:
Balance (in shares)	1,059,000	1,316,000	891,000
Granted (in shares)	336,000	374,000	437,000
Vested (in shares)	(146,000)	(598,000)	(12,000)
Cancelled or forfeited (in shares)	(102,000)	(33,000)	0
Balance (in shares)	1,147,000	1,059,000	1,316,000
Beginning balance, Weighted average grant-date fair value (in dollars per share)	$ 13.40	$ 12.53	$ 12.58
Granted, Weighted average grant-date fair value (in dollars per share)	$ 13.48	$ 12.76	$ 12.31
Vested, Weighted average grant-date fair value (in dollars per share)	$ 15.87	$ 10.92	$ 8.29
Forfeitures, Weighted average grant date fair value	$ 17.45	$ 16.54	$ 0
Ending balance, Weighted average grant-date fair value (in dollars per share)	$ 12.75	$ 13.40	$ 12.53
Phantom Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	131	108	93
Unrecognized Compensation Cost	0
Weighted Average Remaining Amortization Periods (in years)	0 years
Outstanding:
Balance (in shares)	107,000	97,000	87,000
Granted (in shares)	10,000	10,000	10,000
Dividend equivalents issued	2,000	0	0
Redeemed for common stock (in shares)	0	0	0
Balance (in shares)	119,000	107,000	97,000
Granted, Weighted average grant-date fair value (in dollars per share)	$ 13.12	$ 10.75	$ 9.33
Performance Vested Restricted Stock Units [Member] | Not Expected to Vest [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Cost		$ 1,778
Outstanding:
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	75.00%
Performance Vested Restricted Stock Units [Member] | Scheduled to Vest January 1, 2015 [Member]
Exercisable (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Not Expected To Vest Outstanding Number	276,000
Expected to vest	0
Outstanding:
Balance (in shares)	276,000
Performance Vested Restricted Stock Units [Member] | Scheduled to Vest January 1, 2016 [Member]
Exercisable (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Not Expected To Vest Outstanding Number	222,000
Expected to vest	0
Outstanding:
Balance (in shares)	222,000
Performance Vested Restricted Stock Units [Member] | Scheduled to Vest January 1, 2017 [Member]
Exercisable (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Not Expected To Vest Outstanding Number	0
Expected to vest	192,000
Outstanding:
Balance (in shares)	192,000
1998 Stock Option Program [Member]
Outstanding:
Balance (in shares)	95,000
2007 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares authorized under restricted stock, unrestricted stock, RSU's and stock options to officers, employees and non-employee directors (in shares)	6,500,000
Exercisable (in shares)
Available for future grants (in shares)	3,693,000