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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
 [1]
Sep. 30, 2017
 [1]
Jun. 30, 2017
 [1]
Mar. 31, 2017
 [1]
Dec. 31, 2016
 [2]
Sep. 30, 2016
 [2]
Jun. 30, 2016
 [2]
Mar. 31, 2016
 [2]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income (loss) before income taxes:                      
Domestic                 $ 36,657 $ 35,088 $ 22,959
Foreign                 15,925 4,097 (2,729)
Income (loss) before income taxes from continuing operations                 52,582 39,185 20,230
Provision for income taxes:                      
Federal                 2,478 760 386
State and foreign                 11,014 2,575 1,232
Total current expense (benefit)                 13,492 3,335 1,618
Deferred:                      
Federal                 (2,585) (37,828)
State and foreign                 (3,374) (1,896) (2,165)
Total deferred benefit                 (5,959) (39,724) (2,165)
Income Tax Expense (Benefit), Total $ (6,036) $ 3,809 $ 5,189 $ 4,571 $ (39,503) $ 919 $ 1,350 $ 845 $ 7,533 $ (36,389) $ (547)
[1] The impact of the Tax Legislation was an increase in tax expense of $6.2 million due to the one-time deemed repatriation tax, offset by the favorable impacts of the reduced tax rate on the Company's net deferred tax liabilities and other deferred tax adjustments of $(15.3) million related to certain earnings included in the one-time transition tax.
[2] The Company recorded the release of a valuation allowance associated with its U.S. federal, certain state and foreign deferred tax assets for the year ended December 31, 2016.