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Significant Accounting Policies, Derivative Instruments (Details)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2011
Interest rate swaps [Member]
Contract
Dec. 31, 2010
Interest rate swaps [Member]
Contract
Dec. 31, 2013
Interest rate swaps [Member]
USD ($)
Contract
Dec. 31, 2012
Interest rate swaps [Member]
USD ($)
Contract
Dec. 31, 2013
Defined Benefit Pension Plans [Member]
USD ($)
Dec. 31, 2012
Defined Benefit Pension Plans [Member]
USD ($)
Dec. 31, 2013
Commodity contracts [Member]
USD ($)
Dec. 31, 2012
Commodity contracts [Member]
USD ($)
Dec. 31, 2011
Commodity contracts [Member]
USD ($)
Dec. 31, 2011
Commodity forward contract one [Member]
USD ($)
Dec. 31, 2011
Commodity forward contract two [Member]
USD ($)
Dec. 31, 2012
Commodity Forward Contract Three [Member]
USD ($)
Dec. 31, 2013
Commodity forward contract Four [Member]
USD ($)
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 ($)
Dec. 31, 2010
Interest rate swap two [Member]
USD ($)
Dec. 31, 2013
Foreign Currencies [Member]
USD ($)
Dec. 31, 2013
Foreign Currencies [Member]
GBP (£)
Dec. 31, 2013
Interest expense [Member]
Interest rate swaps [Member]
USD ($)
Dec. 31, 2012
Interest expense [Member]
Interest rate swaps [Member]
USD ($)
Derivative [Line Items]                                                    
Maturity period of contracts, maximum                   12 months                                
Number of outstanding contracts           2 2                                      
Derivative, notional amount           $ 200,000 $ 300,000           $ 4,533 $ 1,935 $ 3,472 $ 2,169 $ 100,000 $ 200,000 $ 200,000 $ 100,000 $ 100,000 $ 100,000 $ 650 £ 4,000    
Number of new contracts entered       2 2                                          
Gain (Loss) recognized on derivative contract                   (605) 386 (861)                            
Derivative, fixed LIBOR rate (in hundredths)                                 1.737% 1.905% 1.73% 1.742% 2.22% 1.025%        
Derivative Instruments, Gain (Loss) Net [Abstract]                                                    
Gross               (1,108) [1] (909) [1]                               (2,490) (2,177)
Tax benefit               414 [1] 356 [1]                               109 95
Net of tax 2,381 2,082 0         (694) [1] (553) [1]                               (2,381) (2,082)
Outstanding commodity forward contracts [Abstract]                                                    
Trade Date                         Sep. 19, 2011 Sep. 28, 2011 Oct. 29, 2012 Jun. 21, 2013 Oct. 23, 2013 Apr. 01, 2011 Jan. 21, 2010 Oct. 23, 2013 Apr. 01, 2011 Jun. 29, 2010        
Effective date                         Oct. 01, 2011 Oct. 01, 2011 Jan. 01, 2013 Oct. 01, 2013 Jul. 01, 2014 Jul. 01, 2012 Jul. 01, 2010 Jul. 01, 2014 Oct. 01, 2012 Oct. 01, 2010        
Notional Amount           $ 200,000 $ 300,000           $ 4,533 $ 1,935 $ 3,472 $ 2,169 $ 100,000 $ 200,000 $ 200,000 $ 100,000 $ 100,000 $ 100,000 $ 650 £ 4,000    
Termination Date                         Jun. 30, 2012 Jun. 30, 2012 Sep. 30, 2013 Jun. 30, 2014 Jul. 01, 2018 Jul. 01, 2013 Jul. 01, 2012 Jul. 01, 2018 Oct. 01, 2013 Oct. 01, 2012        
[1] These actuarial losses are included in the computation of net periodic pension cost. See Note 9 – Benefit Plans for additional details.