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Employee Benefit Plans (Details 1) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance $ 49,516,000 $ 41,300,000
Defined Benefit Plan, Funded Status of Plan (63,243,000) (51,801,000)
Pension Plans, Defined Benefit [Member]
    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 41,300,000 35,888,000
Defined Benefit Plan, Actual Return on Plan Assets 5,449,000 540,000
Defined Benefit Plan, Contributions by Employer 8,543,000 6,972,000
Defined Benefit Plan, Contributions by Plan Participants 0 0
Defined Benefit Plan, Benefits Paid (5,776,000) (2,100,000)
Defined Benefit Plan Administrative Expense 0 0
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 49,516,000 41,300,000
Defined Benefit Plan, Funded Status of Plan (63,243,000) (51,801,000)
Other Postretirement Benefit Plans, Defined Benefit [Member]
    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 0 0
Defined Benefit Plan, Actual Return on Plan Assets 0 0
Defined Benefit Plan, Contributions by Employer 129,000 40,000
Defined Benefit Plan, Contributions by Plan Participants 122,000 176,000
Defined Benefit Plan, Benefits Paid (251,000) (216,000)
Defined Benefit Plan Administrative Expense 0 0
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 0 0
Defined Benefit Plan, Funded Status of Plan $ (33,953,000) $ (28,854,000)