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Income Taxes (Provision for Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:                      
Federal                 $ 0 $ 0 $ 0
State                 0 (13) (11)
Foreign                 2,103 1,494 1,686
Current income tax expense (benefit), total                 2,103 1,481 1,675
Deferred:                      
Federal                 0 0 0
State                 0 0 0
Foreign                 (861) (1,112) 1,566
Deferred income tax expense (benefit), total                 (861) (1,112) 1,566
Total $ 1,263 $ (685) $ 460 $ 204 $ (803) $ 421 $ 296 $ 455 $ 1,242 $ 369 $ 3,241