Employee Benefit Plans, Fair Value of Plan Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Plan Assets [Abstract]
Fair value of plan assets	$ 66,137	$ 62,105
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	18,575	32,376
Significant Observable Inputs (Level 2) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	25,909	0
Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	21,653	29,729
Cash and Cash Equivalents [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	4,386	25,951
Cash and Cash Equivalents [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	4,386	25,951
Cash and Cash Equivalents [Member] \| Significant Observable Inputs (Level 2) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	0	0
Cash and Cash Equivalents [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	0	0
Fixed Income [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	3,368	0
Fixed Income [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	3,368	0
Fixed Income [Member] \| Significant Observable Inputs (Level 2) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	0	0
Fixed Income [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	0	0
Mutual Funds [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	8,230	5,040
Mutual Funds [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	8,230	5,040
Mutual Funds [Member] \| Significant Observable Inputs (Level 2) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	0	0
Mutual Funds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	0	0
Equity Partnerships [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	5,823
Equity Partnerships [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	0
Equity Partnerships [Member] \| Significant Observable Inputs (Level 2) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	5,823
Equity Partnerships [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	0
Hedge Funds, Cash [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	2,591	1,385
Hedge Funds, Cash [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	2,591	1,385
Hedge Funds, Cash [Member] \| Significant Observable Inputs (Level 2) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	0	0
Hedge Funds, Cash [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	0	0
Hedge Fund Investments, Long-Short Equity Fund [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	19,818	12,821
Hedge Fund Investments, Long-Short Equity Fund [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	0	0
Hedge Fund Investments, Long-Short Equity Fund [Member] \| Significant Observable Inputs (Level 2) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	9,826	0
Hedge Fund Investments, Long-Short Equity Fund [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	9,992	12,821
Hedge Fund Investments, Event Driven Fund [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	13,694	7,126
Hedge Fund Investments, Event Driven Fund [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	0	0
Hedge Fund Investments, Event Driven Fund [Member] \| Significant Observable Inputs (Level 2) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	6,542	0
Hedge Fund Investments, Event Driven Fund [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	7,152	7,126
Hedge Funds, Distressed Credit [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	5,388	6,252
Hedge Funds, Distressed Credit [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	0	0
Hedge Funds, Distressed Credit [Member] \| Significant Observable Inputs (Level 2) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	2,829	0
Hedge Funds, Distressed Credit [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	2,559	6,252
Hedge Fund Investments, Multi-Strategy Fund [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	2,839	3,530
Hedge Fund Investments, Multi-Strategy Fund [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	0	0
Hedge Fund Investments, Multi-Strategy Fund [Member] \| Significant Observable Inputs (Level 2) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	889	0
Hedge Fund Investments, Multi-Strategy Fund [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	1,950	3,530
Defined Benefit Pension Plan and Benefit Equalization Plan [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	66,137	62,105	61,702
Defined Benefit Pension Plan and Benefit Equalization Plan [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	21,653	29,729	35,096
Defined Benefit Pension Plan and Benefit Equalization Plan [Member] \| Hedge Fund Investments, Long-Short Equity Fund [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	9,992	12,821	12,864
Defined Benefit Pension Plan and Benefit Equalization Plan [Member] \| Hedge Fund Investments, Event Driven Fund [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	7,152	7,126	8,444
Defined Benefit Pension Plan and Benefit Equalization Plan [Member] \| Hedge Funds, Distressed Credit [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	2,559	6,252	9,447
Defined Benefit Pension Plan and Benefit Equalization Plan [Member] \| Hedge Fund Investments, Multi-Strategy Fund [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Pension Plan Assets [Abstract]
Fair value of plan assets	$ 1,950	$ 3,530	$ 4,341

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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