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Employee Benefit Plans (Details 6) (Employee Pension Plans, USD $) In Thousands, unless otherwise specified |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Significant unobservable inputs (Level 3) | Dec. 31, 2012 Significant unobservable inputs (Level 3) | Dec. 31, 2013 Hedge Fund Investments, Long-Short Equity Fund | Dec. 31, 2012 Hedge Fund Investments, Long-Short Equity Fund | Dec. 31, 2013 Hedge Fund Investments, Long-Short Equity Fund Significant unobservable inputs (Level 3) | Dec. 31, 2012 Hedge Fund Investments, Long-Short Equity Fund Significant unobservable inputs (Level 3) | Dec. 31, 2013 Hedge Fund Investments, Event Driven Fund | Dec. 31, 2012 Hedge Fund Investments, Event Driven Fund | Dec. 31, 2013 Hedge Fund Investments, Event Driven Fund Significant unobservable inputs (Level 3) | Dec. 31, 2012 Hedge Fund Investments, Event Driven Fund Significant unobservable inputs (Level 3) | Dec. 31, 2013 Hedge Funds, Distressed Credit | Dec. 31, 2012 Hedge Funds, Distressed Credit | Dec. 31, 2013 Hedge Funds, Distressed Credit Significant unobservable inputs (Level 3) | Dec. 31, 2012 Hedge Funds, Distressed Credit Significant unobservable inputs (Level 3) | Dec. 31, 2013 Hedge Fund Investments, Multi-Strategy Fund | Dec. 31, 2012 Hedge Fund Investments, Multi-Strategy Fund | Dec. 31, 2013 Hedge Fund Investments, Multi-Strategy Fund Significant unobservable inputs (Level 3) | Dec. 31, 2012 Hedge Fund Investments, Multi-Strategy Fund Significant unobservable inputs (Level 3)
Change in Fair Value of Plan Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ 72,617 | $ 66,137 | $ 62,105 | $ 21,653 | $ 29,729 | $ 26,221 | $ 19,818 | $ 9,992 | $ 12,821 | $ 14,680 | $ 13,694 | $ 7,152 | $ 7,126 | $ 1,429 | $ 5,388 | $ 2,559 | $ 6,252 | $ 1,888 | $ 2,839 | $ 1,950 | $ 3,530
Realized gains (losses) |  |  |  | (12) | 7 |  |  |  |  |  |  |  |  |  |  | (7) | 5 |  |  | (5) | 2
Unrealized gains (losses) |  |  |  | 4,604 | 2,684 |  |  | 2,971 | 1,624 |  |  | 1,252 | 522 |  |  | 158 | 365 |  |  | 223 | 173
Purchases |  |  |  | 1,817 | 9,392 |  |  | 1,343 | 5,555 |  |  | 459 | 3,798 |  |  | 6 | 20 |  |  | 9 | 19
Sales |  |  |  | (895) | (1,667) |  |  |  |  |  |  |  |  |  |  | (517) | (894) |  |  | (378) | (773)
Transfer to Level 2 |  |  |  | (3,443) | (18,492) |  |  | (3,443) | (10,008) |  |  |  | (4,294) |  |  |  | (3,189) |  |  |  | (1,001)
Balance at end of year | $ 72,617 | $ 66,137 | $ 62,105 | $ 23,724 | $ 21,653 | $ 26,221 | $ 19,818 | $ 10,863 | $ 9,992 | $ 14,680 | $ 13,694 | $ 8,863 | $ 7,152 | $ 1,429 | $ 5,388 | $ 2,199 | $ 2,559 | $ 1,888 | $ 2,839 | $ 1,799 | $ 1,950
Transfer comprised of hedge funds redeemable period of time |  |  |  | 90 days | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of decrease in plan assets from sales of plan obligations. + References No definition available. + Details
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- Definition Actual return on plan assets, separately identifying the amount related to assets sold during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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