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Pension Benefits Fair Value of Plan Assets in Heirarchy (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 investment Purchases [Member] | Dec. 31, 2012 investment Purchases [Member] | Dec. 31, 2013 Investment Income [Member] | Dec. 31, 2012 Investment Income [Member] | Dec. 31, 2013 Unrealized Investment Gain [Member] | Dec. 31, 2013 Cash And Money Market Funds [Member] | Dec. 31, 2012 Cash And Money Market Funds [Member] | Dec. 31, 2013 Cash And Money Market Funds [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2012 Cash And Money Market Funds [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 Cash And Money Market Funds [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 Cash And Money Market Funds [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 Cash And Money Market Funds [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Cash And Money Market Funds [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 Domestic Equity Securities [Member] | Dec. 31, 2012 Domestic Equity Securities [Member] | Dec. 31, 2013 Domestic Equity Securities [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2012 Domestic Equity Securities [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 Domestic Equity Securities [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 Domestic Equity Securities [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 Domestic Equity Securities [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Domestic Equity Securities [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 International Equity Securities [Member] | Dec. 31, 2012 International Equity Securities [Member] | Dec. 31, 2013 International Equity Securities [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2012 International Equity Securities [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 International Equity Securities [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 International Equity Securities [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 International Equity Securities [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 International Equity Securities [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 Equity Securities [Member] | Dec. 31, 2012 Equity Securities [Member] | Dec. 31, 2013 Equity Securities [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2012 Equity Securities [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 Equity Securities [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 Equity Securities [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 Equity Securities [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Equity Securities [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 High-yield Bonds [Member] | Dec. 31, 2012 High-yield Bonds [Member] | Dec. 31, 2013 High-yield Bonds [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2012 High-yield Bonds [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 High-yield Bonds [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 High-yield Bonds [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 High-yield Bonds [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 High-yield Bonds [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 Fixed Income Funds [Member] | Dec. 31, 2012 Fixed Income Funds [Member] | Dec. 31, 2013 Fixed Income Funds [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2012 Fixed Income Funds [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 Fixed Income Funds [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 Fixed Income Funds [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 Fixed Income Funds [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Fixed Income Funds [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 Floating Rate Corporate Debt [Member] | Dec. 31, 2012 Floating Rate Corporate Debt [Member] | Dec. 31, 2013 Floating Rate Corporate Debt [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2012 Floating Rate Corporate Debt [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 Floating Rate Corporate Debt [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 Floating Rate Corporate Debt [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 Floating Rate Corporate Debt [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Floating Rate Corporate Debt [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 Debt Securities [Member] | Dec. 31, 2012 Debt Securities [Member] | Dec. 31, 2013 Debt Securities [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2012 Debt Securities [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 Debt Securities [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 Debt Securities [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 Commodities Investment [Member] | Dec. 31, 2012 Commodities Investment [Member] | Dec. 31, 2013 Commodities Investment [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2012 Commodities Investment [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 Commodities Investment [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 Commodities Investment [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 Commodities Investment [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Commodities Investment [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 Real Estate Investment [Member] | Dec. 31, 2012 Real Estate Investment [Member] | Dec. 31, 2013 Real Estate Investment [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2012 Real Estate Investment [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 Real Estate Investment [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 Real Estate Investment [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 Real Estate Investment [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Real Estate Investment [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 Hedge Funds [Member] | Dec. 31, 2012 Hedge Funds [Member] | Dec. 31, 2013 Hedge Funds [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2012 Hedge Funds [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 Hedge Funds [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 Hedge Funds [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 Hedge Funds [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Hedge Funds [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 Collective Investment Trust [Member] | Dec. 31, 2013 Collective Investment Trust [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 Collective Investment Trust [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 Collective Investment Trust [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 Other Investments [Member] | Dec. 31, 2012 Other Investments [Member] | Dec. 31, 2013 Other Investments [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2012 Other Investments [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 Other Investments [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 Other Investments [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 Other Investments [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Other Investments [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 3,421 | $ 2,384 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  |  |  |  |  |  |  |  |  | 742 | 2,329 | 161 | 55 | 134 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 24,658 | $ 20,254 | $ 13,940 | $ 18,098 | $ 17,870 | $ 3,139 | $ 0 | $ 3,421 | $ 2,384 |  |  |  |  |  | $ 0 | $ 778 | $ 0 | $ 778 | $ 0 | $ 0 | $ 0 | $ 0 | $ 7,371 | [1] | $ 5,920 | $ 4,888 | [1] | $ 5,920 | $ 2,483 | [1] | $ 0 | $ 0 | [1] | $ 0 | $ 3,373 | [2] | $ 2,740 | $ 3,373 | [2] | $ 2,740 | $ 0 | [2] | $ 0 | $ 0 | [2] | $ 0 | $ 10,744 | $ 8,660 | $ 8,261 | $ 8,660 | $ 2,483 | $ 0 | $ 0 | $ 0 | $ 1,448 | [3] | $ 1,240 |  | $ 1,448 | [3] | $ 1,240 | $ 0 | [3] | $ 0 | $ 0 | [3] | $ 0 | $ 5,006 | [4] | $ 4,204 | [4] | $ 5,006 | [4] | $ 4,204 | [4] | $ 0 | [4] | $ 0 | [4] | $ 0 | [4] | $ 0 | [4] | $ 1,483 | [5] | $ 1,186 | [5] | $ 1,483 | [4] | $ 1,186 | [5] | $ 0 | [4] | $ 0 | [5] | $ 0 | [4] | $ 0 | [5] | $ 7,937 | $ 6,630 | $ 7,937 | $ 6,630 | $ 0 | $ 0 | $ 0 | $ 0 | $ 945 | [6] | $ 669 | [6] | $ 945 | [6] | $ 669 | [6] | $ 0 | [6] | $ 0 | [6] | $ 0 | [6] | $ 0 | [6] | $ 859 | [7] | $ 783 | [7] | $ 0 | [7] | $ 0 | [7] | $ 0 | [7] | $ 0 | [7] | $ 859 | [7] | $ 783 | [7] | $ 3,517 | [8] | $ 2,734 | [8] | $ 955 | [8] | $ 1,133 | [8] | $ 0 | [8] | $ 0 | [8] | $ 2,562 | [8] | $ 1,601 | [8] | $ 656 | [9] | $ 0 | [9] | $ 656 | [9] | $ 0 | [9] | $ 5,977 | $ 4,186 | $ 1,900 | $ 1,802 | $ 656 | $ 0 | $ 3,421 | $ 2,384
Defined Benefit Plan, Asset Allocation | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 3.80% |  |  |  |  |  |  | 29.90% | [1] | 29.20% |  |  |  |  |  |  |  |  |  | 13.70% | [2] | 13.50% |  |  |  |  |  |  |  |  |  | 43.60% | 42.70% |  |  |  |  |  |  | 5.90% | [3] | 6.10% | [3] |  |  |  |  |  |  |  |  |  | 20.30% | [4] | 20.80% | [4] |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% | [5] | 5.90% | [5] |  |  |  |  |  |  |  |  |  |  |  |  | 32.20% | 32.80% |  |  |  |  |  |  | 3.80% | [6] | 3.30% | [6] |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% | [7] | 3.90% | [7] |  |  |  |  |  |  |  |  |  |  |  |  | 14.30% | [8] | 13.50% | [8] |  |  |  |  |  |  |  |  |  |  |  |  | 2.60% | [9] |  |  |  |  |  |  |  | 20.70% |  |  |  |  |  |
[1] | quity securities consist of United States large and small capitalization companies, which are actively traded securities that can be sold upon demand.
[2] | International equity securities consists of a well-diversified portfolio of holdings of mostly large issuers organized in developed countries with liquid markets, commingled with investments in equity securities of issuers located in emerging markets and believed to have strong sustainable financial productivity at attractive valuations.
[3] | High-yield bonds consist of non-investment grade fixed income securities. The investment objective is to obtain high current income. Due to the increased level of default risk, security selection focuses on credit-risk analysis.
[4] | The objective is to achieve value added from sector or issue selection by constructing a portfolio to approximate the investment results of the Barclay's Capital Aggregate Bond Index with a modest amount of variability in duration around the index.
[5] | Investments consist of floating rate bank loans. The interest rates on these loans are typically reset on a periodic basis to account for changes in the level of interest rates.
[6] | Investments with exposure to commodity price movements, primarily through the use of futures, swaps and other commodity-linked securities.
[7] | The investment objective of direct real estate is to provide current income with the potential for long-term capital appreciation. Ownership in real estate entails a long-term time horizon, periodic valuations, and potentially low liquidity.
[8] | The hedge fund portfolio includes an investment in an actively traded global mutual fund that focuses on alternative investments and a hedge fund of funds that invests both long and short using a variety of investment strategies.
[9] | (9)Collective investment trusts invest in short-term investments and are valued at the net asset value of the collective investment trust. The net asset value, as provided by the trustee, is used as a practical expedient to estimate fair value. The net asset value is based on the fair value of the underlying investments held by the fund less its liabilities.

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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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=21915506&loc=d3e1928-114920 Reference 4: 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=6867990&loc=d3e12355-114930 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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