Employee Benefit Plans (Summary of the Fair Value Measurements by Type of Asset) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Total	$ 71,174	$ 72,972	$ 70,627
Cash [Member]
Total	283	268
U.S. Large Cap Growth [Member]
Total	6,507	7,165
U.S. Large Cap Value [Member]
Total	6,401	7,066
U.S. Small/Mid Cap Growth [Member]
Total	2,769	2,950
U.S. Small/Mid Cap Value [Member]
Total	2,649	2,721
Non-U.S. Core [Member]
Total	10,474	10,317
U.S. Large Cap Passive [Member]
Total	7,153	7,192
Emerging Markets [Member]
Total	599	703
U.S. Core Opportunistic [Member]
Total	23,881	24,019
U.S. Passive [Member]
Total	9,328	9,275
Opportunistic [Member]
Total	1,130	1,296
Fair Value, Inputs, Level 1 [Member]
Total	283	268
Fair Value, Inputs, Level 1 [Member] \| Cash [Member]
Total	$ 283	$ 268
Fair Value, Inputs, Level 1 [Member] \| U.S. Large Cap Growth [Member]
Total
Fair Value, Inputs, Level 1 [Member] \| U.S. Large Cap Value [Member]
Total
Fair Value, Inputs, Level 1 [Member] \| U.S. Small/Mid Cap Growth [Member]
Total
Fair Value, Inputs, Level 1 [Member] \| U.S. Small/Mid Cap Value [Member]
Total
Fair Value, Inputs, Level 1 [Member] \| Non-U.S. Core [Member]
Total
Fair Value, Inputs, Level 1 [Member] \| U.S. Large Cap Passive [Member]
Total
Fair Value, Inputs, Level 1 [Member] \| Emerging Markets [Member]
Total
Fair Value, Inputs, Level 1 [Member] \| U.S. Core Opportunistic [Member]
Total
Fair Value, Inputs, Level 1 [Member] \| U.S. Passive [Member]
Total
Fair Value, Inputs, Level 1 [Member] \| Opportunistic [Member]
Total
Fair Value, Inputs, Level 2 [Member]
Total	$ 70,891	$ 72,704
Fair Value, Inputs, Level 2 [Member] \| Cash [Member]
Total
Fair Value, Inputs, Level 2 [Member] \| U.S. Large Cap Growth [Member]
Total	$ 6,507	$ 7,165
Fair Value, Inputs, Level 2 [Member] \| U.S. Large Cap Value [Member]
Total	6,401	7,066
Fair Value, Inputs, Level 2 [Member] \| U.S. Small/Mid Cap Growth [Member]
Total	2,769	2,950
Fair Value, Inputs, Level 2 [Member] \| U.S. Small/Mid Cap Value [Member]
Total	2,649	2,721
Fair Value, Inputs, Level 2 [Member] \| Non-U.S. Core [Member]
Total	10,474	10,317
Fair Value, Inputs, Level 2 [Member] \| U.S. Large Cap Passive [Member]
Total	7,153	7,192
Fair Value, Inputs, Level 2 [Member] \| Emerging Markets [Member]
Total	599	703
Fair Value, Inputs, Level 2 [Member] \| U.S. Core Opportunistic [Member]
Total	23,881	24,019
Fair Value, Inputs, Level 2 [Member] \| U.S. Passive [Member]
Total	9,328	9,275
Fair Value, Inputs, Level 2 [Member] \| Opportunistic [Member]
Total	$ 1,130	$ 1,296