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Derivative Instruments and Hedging Activities (Details) In Thousands, unless otherwise specified | 3 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended |  |  |  |  |  |  | 3 Months Ended |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2014 USD ($) | Mar. 31, 2013 USD ($) | Dec. 31, 2013 USD ($) | Mar. 31, 2014 Interest rate swaps [Member] Contract DerivativeContract | Mar. 31, 2014 Commodity contracts [Member] | Mar. 31, 2013 Commodity forward contract one [Member] USD ($) | Dec. 31, 2013 Commodity forward contract two [Member] USD ($) | Mar. 31, 2014 Commodity Forward Contract Three [Member] USD ($) | Mar. 31, 2014 Commodity forward contract Four [Member] USD ($) | Mar. 31, 2014 Commodity forward contract Five [Member] USD ($) | Mar. 31, 2013 Commodity Forward Contract Six [Member] USD ($) | Mar. 31, 2013 Commodity Forward Contract Seven [Member] USD ($) | Dec. 31, 2013 Interest rate swap one [Member] USD ($) | Dec. 31, 2011 Interest rate swap one [Member] USD ($) | Dec. 31, 2010 Interest rate swap one [Member] USD ($) | Dec. 31, 2013 Interest rate swap two [Member] USD ($) | Dec. 31, 2011 Interest rate swap two [Member] USD ($) | Dec. 31, 2010 Interest rate swap two [Member] USD ($) | Mar. 31, 2014 Foreign Currency Contract [Member] USD ($) | Mar. 31, 2014 Foreign Currency Contract [Member] GBP (£) | Dec. 31, 2013 Foreign Currency Contract [Member] USD ($) | Dec. 31, 2013 Foreign Currency Contract [Member] GBP (£) | Mar. 31, 2013 Foreign Currency Contract [Member] DerivativeContract | Mar. 31, 2014 Derivatives designated as hedging instruments [Member] Interest rate swaps [Member] USD ($) | Dec. 31, 2013 Derivatives designated as hedging instruments [Member] Interest rate swaps [Member] USD ($) | Mar. 31, 2014 Derivatives not designated as hedging instruments [Member] USD ($) | Dec. 31, 2013 Derivatives not designated as hedging instruments [Member] USD ($) | Mar. 31, 2014 Derivatives not designated as hedging instruments [Member] Commodity contracts [Member] USD ($) | Dec. 31, 2013 Derivatives not designated as hedging instruments [Member] Commodity contracts [Member] USD ($) | Mar. 31, 2014 Derivatives not designated as hedging instruments [Member] Foreign Currency Contract [Member] USD ($) | Dec. 31, 2013 Derivatives not designated as hedging instruments [Member] Foreign Currency Contract [Member] USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity period of contracts, maximum (in months) |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months | 12 months |  |  |  |  |  |  |  |  |  |  |
Number of outstanding contracts |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | $ 3,472 | $ 2,169 | $ 2,169 | $ 3,879 | $ 3,014 | $ 2,677 | $ 2,636 | $ 100,000 | $ 200,000 | $ 200,000 | $ 100,000 | $ 100,000 | $ 100,000 | $ 450 | £ 3,000 | $ 650 | £ 4,000 |  |  |  |  |  |  |  |  |
Number of new contracts entered |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total gains or losses recognized | (326) | (292) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, fixed rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 1.737% | 1.905% | 1.73% | 1.742% | 2.22% | 1.025% |  |  |  |  |  |  |  |  |  |  |  |  |
Net derivatives liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 452 | 1,236 | 167 | 1,361 | (255) | 69 | (30) | 56
Fair value of derivative contracts excluding impact of credit risk | 176 |  | 1,385 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding commodity forward contracts [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade Date |  |  |  |  |  | Oct. 29, 2012 | Jun. 21, 2013 | Jun. 21, 2013 | Jan. 31, 2014 | Mar. 11, 2014 | Feb. 26, 2013 | Mar. 01, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective Date |  |  |  |  |  | Jan. 01, 2013 | Oct. 01, 2013 | Oct. 01, 2013 | Feb. 01, 2014 | Apr. 01, 2014 | Mar. 01, 2013 | Mar. 01, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | $ 3,472 | $ 2,169 | $ 2,169 | $ 3,879 | $ 3,014 | $ 2,677 | $ 2,636 | $ 100,000 | $ 200,000 | $ 200,000 | $ 100,000 | $ 100,000 | $ 100,000 | $ 450 | £ 3,000 | $ 650 | £ 4,000 |  |  |  |  |  |  |  |  |
Termination Date |  |  |  |  |  | Sep. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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