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Employee Benefit Plans - Reconciliation of level 3 assets (Details) - Defined Benefit Plans - Real Estate Fund - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 21,661 $ 19,534
Journal acquisition 4,802  
Unrealized gains/(losses) 2,761 2,127
Sales (14,554)  
Ending Balance $ 14,670 $ 21,661