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Income Taxes (Components Of Income Tax Provision) (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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Abstract]                              
Current: U.S. federal                         $ 10,753 $ 23,336 $ 24,688
Current: State                         169 72 1,926
Current: Foreign                         925 6,588 3,165
Current: Total                         11,847 29,996 29,779
Deferred: U.S. federal                         (5,252) (21,624) (7,760)
Deferred: State                         (225) (87) (450)
Deferred: Foreign                         2,602 (2,844) (1,682)
Deferred: Total                         (2,875) (24,555) (9,892)
Total income tax provision $ 29,535 $ (3,524) $ (10,096) $ (6,943) $ 75 $ 1,113 $ 694 $ 3,559 $ 5,248 $ 8,279 $ 4,791 $ 1,569 $ 8,972 $ 5,441 $ 19,887