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Related-Party Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transactions [Abstract]      
Insurance, benefits and incentive plan expenses, related party $ 0 $ 0 $ 50,975
Interest income, related party $ 0 $ 0 $ 1,080