Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Income Tax Expense (Benefit) (Details)

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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:                      
Federal                 $ 932 $ 2,724 $ 1,878
State                 355 114 7
Foreign                 6,786 12,804 4,858
Current income tax expense                 8,073 15,642 6,743
Deferred:                      
Federal                 (2,691) (451) (2,742)
State                 0 37 3
Foreign                 (3,761) (4,654) (2,165)
Deferred income tax benefit                 (6,452) (5,068) (4,904)
Total provision $ 749 $ 235 $ 1,323 $ (686) $ 7,020 $ 1,454 $ 843 $ 1,257 $ 1,621 $ 10,574 $ 1,839