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Employee Benefit Plans (Summary of Changes in the Fair Value of the Level 3 Plan Assets) (Details) - Employee Pension Plans [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Change in Fair Value of Plan Assets |  |  |
Balance at beginning of year |  | $ 75,956 | $ 72,617
Balance at end of year |  | 72,296 | 75,956
Level 3 [Member] |  |  |
Change in Fair Value of Plan Assets |  |  |
Balance at beginning of year |  | 25,131 | 23,724
Realized gains (losses) |  | (82) | 16
Unrealized gains (losses) |  | (70) | 1,464
Purchases |  | 8,498 | 1,076
Sales |  | (5,926) | (3,839)
Reclassified to Level 3 | [1] |  | 2,690
Balance at end of year |  | 27,551 | 25,131
Hedge Fund Investments: Long-Short Equity Fund [Member] |  |  |
Change in Fair Value of Plan Assets |  |  |
Balance at beginning of year |  | 28,633 |
Balance at end of year |  | 29,010 | 28,633
Hedge Fund Investments: Long-Short Equity Fund [Member] | Level 3 [Member] |  |  |
Change in Fair Value of Plan Assets |  |  |
Balance at beginning of year |  | 12,755 | 10,863
Realized gains (losses) |  | (50) |
Unrealized gains (losses) |  | 581 | 843
Purchases |  | 5,631 | 1,049
Sales |  | (2,547) |
Balance at end of year |  | 16,370 | 12,755
Hedge Fund Investments: Event Driven Fund [Member] |  |  |
Change in Fair Value of Plan Assets |  |  |
Balance at beginning of year |  | 13,033 |
Balance at end of year |  | 10,602 | 13,033
Hedge Fund Investments: Event Driven Fund [Member] | Level 3 [Member] |  |  |
Change in Fair Value of Plan Assets |  |  |
Balance at beginning of year |  | 9,562 | 8,863
Realized gains (losses) |  | (16) |
Unrealized gains (losses) |  | (585) | 505
Purchases |  |  | 16
Sales |  | (1,977) | (2,512)
Reclassified to Level 3 | [1] |  | 2,690
Balance at end of year |  | 6,984 | 9,562
Hedge Fund Investment: Distressed Credit [Member] |  |  |
Change in Fair Value of Plan Assets |  |  |
Balance at beginning of year |  | 1,320 |
Balance at end of year |  | 935 | 1,320
Hedge Fund Investment: Distressed Credit [Member] | Level 3 [Member] |  |  |
Change in Fair Value of Plan Assets |  |  |
Balance at beginning of year |  | 1,320 | 2,199
Realized gains (losses) |  | (7) | 13
Unrealized gains (losses) |  | (28) | 57
Purchases |  |  | 5
Sales |  | (350) | (954)
Balance at end of year |  | 935 | 1,320
Hedge Fund Investments: Multi-Strategy Fund [Member] |  |  |
Change in Fair Value of Plan Assets |  |  |
Balance at beginning of year |  | 1,494 |
Balance at end of year |  | 1,262 | 1,494
Hedge Fund Investments: Multi-Strategy Fund [Member] | Level 3 [Member] |  |  |
Change in Fair Value of Plan Assets |  |  |
Balance at beginning of year |  | 1,494 | 1,799
Realized gains (losses) |  | (9) | 3
Unrealized gains (losses) |  | (38) | 59
Purchases |  | 225 | 6
Sales |  | (410) | (373)
Balance at end of year |  | 1,262 | $ 1,494
Hedge Fund Investments: Private Credit [Member] |  |  |
Change in Fair Value of Plan Assets |  |  |
Balance at end of year |  | 2,000 |
Hedge Fund Investments: Private Credit [Member] | Level 3 [Member] |  |  |
Change in Fair Value of Plan Assets |  |  |
Purchases |  | 2,642 |
Sales |  | (642) |
Balance at end of year |  | $ 2,000 |
[1] | The transfer of $2.7 million from Level 2 to Level 3 was comprised of certain hedge funds that were moved due to liquidity.

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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=58740216&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=58740216&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=58740216&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=58740216&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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: 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=58740216&loc=d3e1928-114920 + Details
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