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Pension and Other Postretirement Benefits Net Periodic Benefit Cost (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Plans, Defined Benefit [Member]
      
Service cost $ 4,735 $ 2,802 $ 3,133
Interest cost 8,908 6,871 6,976
Expected return on plan assets (10,592) (6,962) (6,631)
Amortization of prior service costs 113 137 137
Amortization of net loss 3,152 3,642 1,863
Net periodic benefit cost 6,316 6,490 5,478
Special termination benefits 0 0 1,147
Curtailment cost (18) 0 0
Total net periodic benefit cost 6,298 6,490 6,625
Other Postretirement Benefit Plans, Defined Benefit [Member]
      
Service cost 2,527 1,790 1,668
Interest cost 5,681 5,512 5,728
Expected return on plan assets 0 0 0
Amortization of prior service costs (3,995) (4,250) (32,814)
Amortization of net loss 5,022 6,195 15,063
Net periodic benefit cost 9,235 9,247 (10,355)
Special termination benefits 0 0 0
Curtailment cost (20) 0 0
Total net periodic benefit cost $ 9,215 $ 9,247 $ (10,355)