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Benefit Plans and Other Postretirement Benefits, Changes in Level 3 Postretirement Benefit Plan Assets (Details) - Postretirement Benefit Plan - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Changes in Level 3 Plan Assets [Roll Forward]      
Fair value of plan assets at Jan. 1 $ 475,058 $ 492,036  
Fair value of plan assets at Dec. 31 447,633 475,058 $ 492,036
Level 3      
Changes in Level 3 Plan Assets [Roll Forward]      
Fair value of plan assets at Jan. 1 0 0 40,715
Net realized gains (losses)     0
Net unrealized gains (losses)     0
Purchases, issuances and settlements, net     0
Transfers in (out) of Level 3 [1]     (40,715)
Fair value of plan assets at Dec. 31 0 0 0
Asset-backed securities      
Changes in Level 3 Plan Assets [Roll Forward]      
Fair value of plan assets at Jan. 1 3,619    
Fair value of plan assets at Dec. 31 28,691 3,619  
Asset-backed securities | Level 3      
Changes in Level 3 Plan Assets [Roll Forward]      
Fair value of plan assets at Jan. 1 0    
Fair value of plan assets at Dec. 31 0 0  
Mortgage-backed securities      
Changes in Level 3 Plan Assets [Roll Forward]      
Fair value of plan assets at Jan. 1 11,250    
Fair value of plan assets at Dec. 31 35,612 11,250  
Mortgage-backed securities | Level 3      
Changes in Level 3 Plan Assets [Roll Forward]      
Fair value of plan assets at Jan. 1 0    
Fair value of plan assets at Dec. 31 $ 0 0  
Private equity investments | Level 3      
Changes in Level 3 Plan Assets [Roll Forward]      
Fair value of plan assets at Jan. 1   0 757
Net realized gains (losses)     0
Net unrealized gains (losses)     0
Purchases, issuances and settlements, net     0
Transfers in (out) of Level 3 [1]     (757)
Fair value of plan assets at Dec. 31     0
Real estate | Level 3      
Changes in Level 3 Plan Assets [Roll Forward]      
Fair value of plan assets at Jan. 1   $ 0 39,958
Net realized gains (losses)     0
Net unrealized gains (losses)     0
Purchases, issuances and settlements, net     0
Transfers in (out) of Level 3 [1]     (39,958)
Fair value of plan assets at Dec. 31     $ 0
[1] Transfers out of Level 3 into Level 2 were principally due to diminished use of unobservable inputs that were previously significant to these fair value measurements and were subsequently sold during 2013.