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Pension and Other Postretirement Benefit Plans - Summary of Fair Value of LPP Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total plan assets at fair value $ 326,586 $ 359,099  
Money market fund      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total plan assets at fair value 5,148 4,709  
Real Estate      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total plan assets at fair value 17,308 15,214  
Common Collective Trusts | Fixed income securities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total plan assets at fair value 180,717 199,683  
Common Collective Trusts | Global | Global equities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total plan assets at fair value 123,413 139,493  
Fair Value, Inputs, Level 1      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total plan assets at fair value 5,148 4,709  
Fair Value, Inputs, Level 1 | Money market fund      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total plan assets at fair value 5,148 4,709  
Fair Value, Inputs, Level 2      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total plan assets at fair value 304,130 339,176  
Fair Value, Inputs, Level 2 | Common Collective Trusts | Fixed income securities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total plan assets at fair value 180,717 199,683  
Fair Value, Inputs, Level 2 | Common Collective Trusts | Global | Global equities      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total plan assets at fair value 123,413 139,493  
Fair Value, Inputs, Level 3      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total plan assets at fair value 17,308 15,214  
Fair Value, Inputs, Level 3 | Real Estate      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total plan assets at fair value $ 17,308 $ 15,214 $ 21,714