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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Pension Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,129 $ 2,196 $ 4,012 $ 3,728
Interest cost 1,020 1,090 2,038 2,070
Expected return on plan assets (1,100) (799) (1,867) (1,533)
Amortization of prior service cost 213 87 307 186
Amortization of prior actuarial loss 782 1,388 1,619 1,663
Total 3,044 3,962 6,109 6,114
Other Benefits
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 410 279 820 558
Interest cost 311 258 623 517
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of prior actuarial loss 186 89 372 177
Total $ 907 $ 626 $ 1,815 $ 1,252