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Income Taxes - Provision (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current tax expense:      
U.S. federal $ 2,726 $ 47 $ 971
State and local 189 49 254
Foreign 9,028 8,127 6,426
Total current 11,943 8,223 7,651
Deferred tax (benefit) expense:      
U.S. federal (4,588) (687) (101)
State and local (87) 74 (67)
Foreign (466) 307 (1,410)
Total deferred (5,141) (306) (1,578)
Total provision for income taxes $ 6,802 $ 7,917 $ 6,073