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Other Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other Liabilities [Abstract]    
Deferred tax liabilities $ 36,718 $ 643
Reserve for other tax liabilities 7,163 6,264
Liability for deferred compensation plan 43,248 36,730
Pension plan benefits reserve 6,359 5,631
Build to suit - financing obligation 10,290 9,543
Deferred rent and deferred tenant incentives 6,389 5,952
Asset retirement obligation 6,578 5,682
Other 10,371 6,354
Total other liabilities $ 127,116 $ 76,799