Share-Based Payment Arrangements (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Stock Options, Outstanding at January 1, 2013	1,404,989
Stock Options, Granted	0
Stock Options, Exercised	0
Stock Options, Forfeited or expired	0
Stock Options, Outstanding at March 31, 2013	1,404,989
Stock Options, Exercisable at March 31, 2013	1,111,418
Weighted Average Exercise Price, Outstanding at January 1, 2013	$ 9.63
Weighted Average Exercise Price, Outstanding at March 31, 2013	$ 9.63
Weighted Average Exercise Price, Exercisable at March 31, 2013	$ 10.40
Average Remaining Contractual Term, Outstanding at March 31, 2013	5 years
Average Remaining Contractual Term, Exercisable at March 31, 2013	4 years 8 months 12 days
Aggregate Intrinsic Value,Outstanding at March 31, 2013	$ 1,421
Aggregate Intrinsic Value, Exercisable at March 31, 2013	$ 758