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Defined Benfit Plan (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Jun. 30, 2013 Significant Observable Inputs, Level 2 [Member] | Dec. 31, 2012 Significant Observable Inputs, Level 2 [Member] | Jun. 30, 2013 Significant Unobservable Inputs, Level 3 [Member] | Dec. 31, 2012 Significant Unobservable Inputs, Level 3 [Member] | Jun. 30, 2013 Equity Securities [Member] | Dec. 31, 2012 Equity Securities [Member] | Jun. 30, 2013 Fixed Income Securities [Member] | Dec. 31, 2012 Fixed Income Securities [Member] | Jun. 30, 2013 Cash and cash equivalents [Member] | Dec. 31, 2012 Cash and cash equivalents [Member] | Jun. 30, 2013 Cash and cash equivalents [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Dec. 31, 2012 Cash and cash equivalents [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Jun. 30, 2013 Cash and cash equivalents [Member] Significant Observable Inputs, Level 2 [Member] | Dec. 31, 2012 Cash and cash equivalents [Member] Significant Observable Inputs, Level 2 [Member] | Jun. 30, 2013 Cash and cash equivalents [Member] Significant Unobservable Inputs, Level 3 [Member] | Dec. 31, 2012 Cash and cash equivalents [Member] Significant Unobservable Inputs, Level 3 [Member] | Jun. 30, 2013 Actively Managed [Member] All Cap Equity Fund [Member] | Jun. 30, 2013 Actively Managed [Member] All Cap Equity Fund [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Jun. 30, 2013 Actively Managed [Member] All Cap Equity Fund [Member] Significant Observable Inputs, Level 2 [Member] | Jun. 30, 2013 Actively Managed [Member] All Cap Equity Fund [Member] Significant Unobservable Inputs, Level 3 [Member] | Jun. 30, 2013 Actively Managed [Member] U.S. Large Cap Equity [Member] | Dec. 31, 2012 Actively Managed [Member] U.S. Large Cap Equity [Member] | Jun. 30, 2013 Actively Managed [Member] U.S. Large Cap Equity [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Dec. 31, 2012 Actively Managed [Member] U.S. Large Cap Equity [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Jun. 30, 2013 Actively Managed [Member] U.S. Large Cap Equity [Member] Significant Observable Inputs, Level 2 [Member] | Dec. 31, 2012 Actively Managed [Member] U.S. Large Cap Equity [Member] Significant Observable Inputs, Level 2 [Member] | Jun. 30, 2013 Actively Managed [Member] U.S. Large Cap Equity [Member] Significant Unobservable Inputs, Level 3 [Member] | Dec. 31, 2012 Actively Managed [Member] U.S. Large Cap Equity [Member] Significant Unobservable Inputs, Level 3 [Member] | Jun. 30, 2013 Actively Managed [Member] U.S. Mid Cap Equity [Member] | Dec. 31, 2012 Actively Managed [Member] U.S. Mid Cap Equity [Member] | Jun. 30, 2013 Actively Managed [Member] U.S. Mid Cap Equity [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Dec. 31, 2012 Actively Managed [Member] U.S. Mid Cap Equity [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Jun. 30, 2013 Actively Managed [Member] U.S. Mid Cap Equity [Member] Significant Observable Inputs, Level 2 [Member] | Dec. 31, 2012 Actively Managed [Member] U.S. Mid Cap Equity [Member] Significant Observable Inputs, Level 2 [Member] | Jun. 30, 2013 Actively Managed [Member] U.S. Mid Cap Equity [Member] Significant Unobservable Inputs, Level 3 [Member] | Dec. 31, 2012 Actively Managed [Member] U.S. Mid Cap Equity [Member] Significant Unobservable Inputs, Level 3 [Member] | Jun. 30, 2013 Actively Managed [Member] U.S. Small Cap Equity [Member] | Dec. 31, 2012 Actively Managed [Member] U.S. Small Cap Equity [Member] | Jun. 30, 2013 Actively Managed [Member] U.S. Small Cap Equity [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Dec. 31, 2012 Actively Managed [Member] U.S. Small Cap Equity [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Jun. 30, 2013 Actively Managed [Member] U.S. Small Cap Equity [Member] Significant Observable Inputs, Level 2 [Member] | Dec. 31, 2012 Actively Managed [Member] U.S. Small Cap Equity [Member] Significant Observable Inputs, Level 2 [Member] | Jun. 30, 2013 Actively Managed [Member] U.S. Small Cap Equity [Member] Significant Unobservable Inputs, Level 3 [Member] | Dec. 31, 2012 Actively Managed [Member] U.S. Small Cap Equity [Member] Significant Unobservable Inputs, Level 3 [Member] | Jun. 30, 2013 Actively Managed [Member] Non-U.S. Large Cap Equity [Member] | Dec. 31, 2012 Actively Managed [Member] Non-U.S. Large Cap Equity [Member] | Jun. 30, 2013 Actively Managed [Member] Non-U.S. Large Cap Equity [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Dec. 31, 2012 Actively Managed [Member] Non-U.S. Large Cap Equity [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Jun. 30, 2013 Actively Managed [Member] Non-U.S. Large Cap Equity [Member] Significant Observable Inputs, Level 2 [Member] | Dec. 31, 2012 Actively Managed [Member] Non-U.S. Large Cap Equity [Member] Significant Observable Inputs, Level 2 [Member] | Jun. 30, 2013 Actively Managed [Member] Non-U.S. Large Cap Equity [Member] Significant Unobservable Inputs, Level 3 [Member] | Dec. 31, 2012 Actively Managed [Member] Non-U.S. Large Cap Equity [Member] Significant Unobservable Inputs, Level 3 [Member] | Jun. 30, 2013 Passive Index Fund ETFs [Member] REIT [Member] | Dec. 31, 2012 Passive Index Fund ETFs [Member] REIT [Member] | Jun. 30, 2013 Passive Index Fund ETFs [Member] REIT [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Dec. 31, 2012 Passive Index Fund ETFs [Member] REIT [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Jun. 30, 2013 Passive Index Fund ETFs [Member] REIT [Member] Significant Observable Inputs, Level 2 [Member] | Dec. 31, 2012 Passive Index Fund ETFs [Member] REIT [Member] Significant Observable Inputs, Level 2 [Member] | Jun. 30, 2013 Passive Index Fund ETFs [Member] REIT [Member] Significant Unobservable Inputs, Level 3 [Member] | Dec. 31, 2012 Passive Index Fund ETFs [Member] REIT [Member] Significant Unobservable Inputs, Level 3 [Member] | Jun. 30, 2013 Fixed Income [Member] | Dec. 31, 2012 Fixed Income [Member] | Jun. 30, 2013 Fixed Income [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Dec. 31, 2012 Fixed Income [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Jun. 30, 2013 Fixed Income [Member] Significant Observable Inputs, Level 2 [Member] | Dec. 31, 2012 Fixed Income [Member] Significant Observable Inputs, Level 2 [Member] | Jun. 30, 2013 Fixed Income [Member] Significant Unobservable Inputs, Level 3 [Member] | Dec. 31, 2012 Fixed Income [Member] Significant Unobservable Inputs, Level 3 [Member]
Components of Net Periodic Benefit Cost [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ 1,239 | $ 1,157 | $ 2,478 | $ 2,314 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest cost | 1,475 | 1,450 | 2,950 | 2,901 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other cost | 1,208 | 1,166 | 2,416 | 2,332 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected return on assets | (1,380) | (1,148) | (2,760) | (2,297) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit cost | 2,542 | 2,625 | 5,084 | 5,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets | 82,176 |  | 82,176 |  | 79,020 | 42,037 | 40,137 | 40,139 | 38,883 | 0 | 0 |  |  |  |  | 3,868 | 7,056 | 3,868 | 7,056 | 0 | 0 | 0 | 0 | 256 | [1] | 243 | [1] | 13 | [1] | 0 | [1] | 26,647 | [1] | 22,749 | [1] | 26,647 | [1] | 22,749 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 4,590 | [1] | 3,989 | [1] | 4,590 | [1] | 3,989 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 2,562 | [1] | 2,174 | [1] | 2,562 | [1] | 2,174 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 4,127 | [1] | 4,169 | [1] | 4,127 | [1] | 4,169 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 3,998 | [1] | 3,792 | [1] | 0 | [1] | 0 | [1] | 3,998 | [1] | 3,792 | [1] | 0 | [1] | 0 | [1] | 36,128 | [2] | 35,091 | [2] | 0 | [2] | 0 | [2] | 36,128 | [2] | 35,091 | [2] | 0 | [2] | 0 | [2]
Target plan asset allocations |  |  |  |  |  |  |  |  |  |  |  | 55.00% | 55.00% | 45.00% | 45.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer Contributions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated employer contributions for the current fiscal year | 10,300 |  | 10,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual employer contribution amount in current period | $ 1,489 |  | $ 1,489 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Actively managed portfolio of securities with the goal to exceed the stated benchmark performance.
[2] | Actively managed portfolio of fixed income securities with the goal to exceed the Barclays 1-5 Year Government/Credit, Barclays Intermediate Government/Credit, and Merrill Lynch Preferred Stock Fixed Rate.

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- Definition The employer's best estimate of total contributions expected to be paid to the plan for the current fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. + References No definition available. + Details
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- Definition The total amount of required and discretionary contributions made by an employer to a defined contribution plan during the period. + References No definition available. + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512136 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + 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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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + 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 (h)(2) -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 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of other defined benefit plan costs. + References No definition available. + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + 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 (h)(1) -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 -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + 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)(i) -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)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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