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Employee Benefit Plans (Fair Value of Plan Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets     $ 17,399
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of period   17,399 26,841
Unrealized gains (losses)     (752)
Unrealized gains relating to instruments held at the reporting date     635
Settlements     (9,604)
Purchases     279
Transfer out of Level 3 (14,500) 0 0
Fair value of plan assets at end of period     17,399
Pension Plans
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 219,534 209,424 195,659
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 219,534 209,424 195,659
Pension Plans | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 60,240 65,689  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 60,240 65,689  
Pension Plans | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 159,294 129,235  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 159,294 129,235  
Pension Plans | Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 14,500  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of period 14,500 17,399  
Unrealized gains (losses) 0 992  
Unrealized gains relating to instruments held at the reporting date 0 242  
Settlements 0 (4,948)  
Purchases 0 815  
Fair value of plan assets at end of period 0 14,500  
Pension Plans | United States equities
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 42,197 50,979  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 42,197 50,979  
Pension Plans | United States equities | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 34,117 41,907  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 34,117 41,907  
Pension Plans | United States equities | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8,080 9,072  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 8,080 9,072  
Pension Plans | United States equities | Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 0 0  
Pension Plans | Global equities
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 33,409 34,479  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 33,409 34,479  
Pension Plans | Global equities | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20,153 23,782  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 20,153 23,782  
Pension Plans | Global equities | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13,256 10,697  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 13,256 10,697  
Pension Plans | Global equities | Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 0 0  
Pension Plans | Fixed income
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 61,121 78,806  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 61,121 78,806  
Pension Plans | Fixed income | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 0 0  
Pension Plans | Fixed income | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 61,121 78,806  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 61,121 78,806  
Pension Plans | Fixed income | Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 0 0  
Pension Plans | Alternative investments
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 37,292 42,159  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 37,292 42,159  
Pension Plans | Alternative investments | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 0 0  
Pension Plans | Alternative investments | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 37,292 27,659  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 37,292 27,659  
Pension Plans | Alternative investments | Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 14,500  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 0 14,500  
Pension Plans | Cash and cash equivalents
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 45,515 3,001  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 45,515 3,001  
Pension Plans | Cash and cash equivalents | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5,970 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 5,970 0  
Pension Plans | Cash and cash equivalents | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 39,545 3,001  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 39,545 3,001  
Pension Plans | Cash and cash equivalents | Level 3
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 0 0  
Postretirement Benefit Plans
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 98,933 87,189 78,121
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 98,933 87,189 78,121
Postretirement Benefit Plans | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 60,102 52,531  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 60,102 52,531  
Postretirement Benefit Plans | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 38,831 34,658  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 38,831 34,658  
Postretirement Benefit Plans | United States equities
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 43,054 37,482  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 43,054 37,482  
Postretirement Benefit Plans | United States equities | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 43,054 37,482  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 43,054 37,482  
Postretirement Benefit Plans | United States equities | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 0 0  
Postretirement Benefit Plans | Global equities
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17,048 15,049  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 17,048 15,049  
Postretirement Benefit Plans | Global equities | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17,048 15,049  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 17,048 15,049  
Postretirement Benefit Plans | Global equities | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 0 0  
Postretirement Benefit Plans | Fixed income
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 38,831 34,658  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 38,831 34,658  
Postretirement Benefit Plans | Fixed income | Level 1
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period 0 0  
Postretirement Benefit Plans | Fixed income | Level 2
      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 38,831 34,658  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at end of period $ 38,831 $ 34,658