XML 103 R87.htm IDEA: XBRL DOCUMENT v3.6.0.2
Employee Benefit Plans - Reconciliation of level 3 assets (Details) - Defined benefit plans - Real Estate Fund - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 14,670 $ 21,661
Purchases 5,400 4,802
Unrealized gains/(losses) 1,576 2,761
Sales   (14,554)
Ending Balance $ 21,646 $ 14,670