Share-Based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Share-Based Compensation [Abstract]
Share-based compensation costs	$ 1,858	$ 1,920	$ 3,558	$ 3,458
Shares [Roll Forward]
Outstanding, beginning of period (in shares)			4,325
Granted (in shares)			98
Exercised (in shares)			(106)
Forfeited (in shares)			(59)
Expired (in shares)			(28)
Outstanding, end of period (in shares)	4,230		4,230
Exercisable, end of period (in shares)	2,441		2,441
Weighted-Average Exercise Price [Roll Forward]
Outstanding, beginning of period (in dollars per share)			$ 15.09
Granted (in dollars per share)			$ 16.60
Exercised (in dollars per share)			$ 12.39
Forfeited (in dollars per share)			$ 13
Expired (in dollars per share)			$ 33.49
Outstanding, end of period (in dollars per share)	$ 15.09		$ 15.09
Exercisable, end of period (in dollars per share)	$ 17.72		$ 17.72
Weighted-Average Remaining Contractual Term (years) [Abstract]
Outstanding at June 30, 2014			6 years 0 months 14 days
Exercisable at June 30, 2014			4 years 7 months 13 days
Aggregate Intrinsic Value [Abstract]
Outstanding at June 30, 2014	20,135		20,135
Exercisable at June 30, 2014	$ 9,335		$ 9,335
Weighted average grant-date fair value of options per share (in dollars per share)	$ 9.10		$ 9.05
Restricted Stock and Restricted Stock Units (RSUs) [Member]
Shares [Roll Forward]
Nonvested, beginning of period (in shares)			841
Granted (in shares)			264
Vested (in shares)			(160)
Forfeited (in shares)			(21)
Nonvested, end of period (in shares)	924		924
Weighted-Average Grant Date Fair Value [Roll Forward]
Nonvested, beginning of period (in dollars per share)			$ 10.44
Granted (in dollars per share)			$ 16.71
Vested (in dollars per share)			$ 10.92
Forfeited (in dollars per share)			$ 11.16
Nonvested, end of period (in dollars per share)	$ 12.14		$ 12.14
Performance Shares [Member]
Shares [Roll Forward]
Nonvested, beginning of period (in shares)			0
Granted (in shares)			303
Vested (in shares)			0
Forfeited (in shares)			0
Nonvested, end of period (in shares)	303		303
Weighted-Average Grant Date Fair Value [Roll Forward]
Nonvested, beginning of period (in dollars per share)			$ 0
Granted (in dollars per share)			$ 14.74
Vested (in dollars per share)			$ 0
Forfeited (in dollars per share)			$ 0
Nonvested, end of period (in dollars per share)	$ 14.74		$ 14.74