Employee Benefit Plans (Details 5) (Employee Pension Plans, USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plan Assets
Fair value of plan assets	$ 72,617	$ 66,137	$ 62,105
Quoted prices in active markets (Level 1)
Pension Plan Assets
Fair value of plan assets	21,523	18,575
Significant other observable inputs (Level 2)
Pension Plan Assets
Fair value of plan assets	27,370	25,909
Significant unobservable inputs (Level 3)
Pension Plan Assets
Fair value of plan assets	23,724	21,653	29,729
Cash and Cash Equivalents
Pension Plan Assets
Fair value of plan assets	3,762	4,386
Cash and Cash Equivalents | Quoted prices in active markets (Level 1)
Pension Plan Assets
Fair value of plan assets	3,762	4,386
Fixed Income
Pension Plan Assets
Fair value of plan assets	4,000	3,368
Fixed Income | Quoted prices in active markets (Level 1)
Pension Plan Assets
Fair value of plan assets	4,000	3,368
Mutual Funds
Pension Plan Assets
Fair value of plan assets	13,234	8,230
Mutual Funds | Quoted prices in active markets (Level 1)
Pension Plan Assets
Fair value of plan assets	13,234	8,230
Equity Partnerships
Pension Plan Assets
Fair value of plan assets	6,876	5,823
Equity Partnerships | Significant other observable inputs (Level 2)
Pension Plan Assets
Fair value of plan assets	6,876	5,823
Hedge Funds, Cash
Pension Plan Assets
Fair value of plan assets	527	2,591
Hedge Funds, Cash | Quoted prices in active markets (Level 1)
Pension Plan Assets
Fair value of plan assets	527	2,591
Hedge Fund Investments, Long-Short Equity Fund
Pension Plan Assets
Fair value of plan assets	26,221	19,818
Hedge Fund Investments, Long-Short Equity Fund | Significant other observable inputs (Level 2)
Pension Plan Assets
Fair value of plan assets	14,566	9,826
Hedge Fund Investments, Long-Short Equity Fund | Significant unobservable inputs (Level 3)
Pension Plan Assets
Fair value of plan assets	10,863	9,992	12,821
Hedge Fund Investments, Event Driven Fund
Pension Plan Assets
Fair value of plan assets	14,680	13,694
Hedge Fund Investments, Event Driven Fund | Significant other observable inputs (Level 2)
Pension Plan Assets
Fair value of plan assets	5,928	6,542
Hedge Fund Investments, Event Driven Fund | Significant unobservable inputs (Level 3)
Pension Plan Assets
Fair value of plan assets	8,863	7,152	7,126
Hedge Funds, Distressed Credit
Pension Plan Assets
Fair value of plan assets	1,429	5,388
Hedge Funds, Distressed Credit | Significant other observable inputs (Level 2)
Pension Plan Assets
Fair value of plan assets		2,829
Hedge Funds, Distressed Credit | Significant unobservable inputs (Level 3)
Pension Plan Assets
Fair value of plan assets	2,199	2,559	6,252
Hedge Fund Investments, Multi-Strategy Fund
Pension Plan Assets
Fair value of plan assets	1,888	2,839
Hedge Fund Investments, Multi-Strategy Fund | Significant other observable inputs (Level 2)
Pension Plan Assets
Fair value of plan assets		889
Hedge Fund Investments, Multi-Strategy Fund | Significant unobservable inputs (Level 3)
Pension Plan Assets
Fair value of plan assets	$ 1,799	$ 1,950	$ 3,530