Retirement Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Cost Recognized	$ 1,070	$ 930	$ 803
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual Benefit Amount	50
Year of Benefit	20 years
Defined Contribution Plan, Number of Employees Covered	2
Defined Contribution Plan, Cost Recognized	35	55	60
Pension and Other Postretirement Defined Benefit Plans, Liabilities	$ 904	$ 918