Employee Benefit Plans (Summary of the Fair Value Measurements by Type of Asset) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Total	$ 70,627	$ 61,384	$ 53,895
Cash [Member]
Total	245	238
U.S. Large Cap Growth [Member]
Total	6,650	5,193
U.S. Large Cap Value [Member]
Total	6,835	5,317
U.S. Small/Mid Cap Growth [Member]
Total	2,825	2,159
U.S. Small/Mid Cap Value [Member]
Total	2,784	2,167
Non-U.S. Core [Member]
Total	10,840	9,478
U.S. Large Cap Passive [Member]
Total	6,929	6,004
Emerging Markets [Member]
Total	711	732
U.S. Core Opportunistic [Member]
Total	22,720	22,189
U.S. Passive [Member]
Total	8,747	7,907
Opportunistic [Member]
Total	1,341
Fair Value, Inputs, Level 1 [Member]
Total	245	238
Fair Value, Inputs, Level 1 [Member] | Cash [Member]
Total	245	238
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	70,382	61,146
Fair Value, Inputs, Level 2 [Member] | Cash [Member]
Total
Fair Value, Inputs, Level 2 [Member] | U.S. Large Cap Growth [Member]
Total	6,650	5,193
Fair Value, Inputs, Level 2 [Member] | U.S. Large Cap Value [Member]
Total	6,835	5,317
Fair Value, Inputs, Level 2 [Member] | U.S. Small/Mid Cap Growth [Member]
Total	2,825	2,159
Fair Value, Inputs, Level 2 [Member] | U.S. Small/Mid Cap Value [Member]
Total	2,784	2,167
Fair Value, Inputs, Level 2 [Member] | Non-U.S. Core [Member]
Total	10,840	9,478
Fair Value, Inputs, Level 2 [Member] | U.S. Large Cap Passive [Member]
Total	6,929	6,004
Fair Value, Inputs, Level 2 [Member] | Emerging Markets [Member]
Total	711	732
Fair Value, Inputs, Level 2 [Member] | U.S. Core Opportunistic [Member]
Total	22,720	22,189
Fair Value, Inputs, Level 2 [Member] | U.S. Passive [Member]
Total	8,747	7,907
Fair Value, Inputs, Level 2 [Member] | Opportunistic [Member]
Total	$ 1,341