Pension Plan (Details) - Pension plan assets by level within the fair value hierarchy - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Level 1:
Fair Value, Pension plan assets, Total	$ 8,193	$ 7,946	$ 7,077
Fair Value, Inputs, Level 1 [Member]
Level 1:
Fair Value, Pension plan assets, Total	8,193	7,946
Fair Value, Inputs, Level 1 [Member] | Equity And Index Funds [Member]
Level 1:
Fair Value, Pension plan assets, Total	5,615	5,551
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member]
Level 1:
Fair Value, Pension plan assets, Total	$ 2,578	$ 2,395
Fair Value, Inputs, Level 2 [Member]
Level 1:
Fair Value, Pension plan assets, Total
Fair Value, Inputs, Level 3 [Member]
Level 1:
Fair Value, Pension plan assets, Total