Stock-Based Compensation (Details) (1999 Stock Option Plan [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
1999 Stock Option Plan [Member]
Shares [Roll Forward]
Outstanding, beginning of period (in shares)	77,000
Exercised (in shares)	0	4,500
Forfeited or expired (in shares)	0
Outstanding, end of period (in shares)	77,000
Exercisable, end of period (in shares)	77,000
Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 22.82
Exercised (in dollars per share)	$ 0
Forfeited or expired (in dollars per share)	$ 0
Outstanding, end of period (in dollars per share)	$ 22.82
Exercisable, end of period (in dollars per share)	$ 22.82
Weighted Average Remaining Contractual Term [Abstract]
Outstanding	4 years 1 month 13 days
Exercisable	4 years 1 month 13 days
Aggregate Intrinsic Value [Abstract]
Outstanding	$ 562
Exercisable	562
Intrinsic value of options exercised in period		$ 46