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Change in Accounting Principle (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other assets $ 12,685 $ 10,543
Long-term debt 490,160 488,250
Previous Accounting Method [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other assets 16,211 14,736
Long-term debt 493,686 492,443
Effect of Change in Accounting Principle [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other assets (3,526) (4,193)
Long-term debt $ (3,526) $ (4,193)