Share-Based Payment Arrangements (Summary of the Status of Stock Options) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Share-Based Payment Arrangements [Abstract]
Stock Options, Outstanding at January 1, 2015	1,062,134
Stock options, granted
Stock Options, Exercised	(28,449)
Stock Options, Forfeited or Expired	(45,718)
Stock Options, Outstanding at March 31, 2015	987,967
Stock Options, Exercisable at March 31, 2015	880,109
Weighted Average Exercise Price, Outstanding at January 1, 2015	$ 9.51
Weighted Average Exercise Price, Exercised	$ 7.10
Weighted Average Exercise Price, Forfeited or Expired	$ 11.48
Weighted Average Exercise Price, Outstanding at March 31, 2015	$ 9.49
Weighted Average Exercise Price, Exercisable at March 31, 2015	$ 9.84
Average Remaining Contractual Term, Outstanding at March 31, 2015	3 years 1 month 6 days
Average Remaining Contractual Term, Exercisable at March 31, 2015	3 years
Aggregate Intrinsic Value, Outstanding at March 31, 2015	$ 1,841
Aggregate Intrinsic Value, Exercisable at March 31, 2015	$ 1,411