Annual report pursuant to Section 13 and 15(d)

INCOME TAXES (Reconciliation of Income Tax from Statutory Rates to Income Tax Expense (Benefit)) (Details)

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INCOME TAXES (Reconciliation of Income Tax from Statutory Rates to Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Income tax expense (benefit) at United States statutory rates   $ (3,283) $ 16,914 $ 2,223
State income taxes, net of federal tax benefits   1,544 3,264 3,959
Differences between foreign and United States statutory rates   (10,887) (11,116) (5,356)
United States tax reform rate change $ (55,685) (55,685) 0 0
Non-United States income inclusions and exclusions   3,826 (2,749) 655
United States income inclusions and exclusions   11,347 (1,317) 2,095
Nondeductible items   11,380 3,210 4,736
Tax contingencies   1,955 2,390 2,063
Tax expense from acquired goodwill   4,489 5,936 4,483
Change in valuation allowance   18,067 11,820 7,116
Other, net   93 (323) 148
Income tax expense (benefit)   $ (17,154) $ 28,029 $ 22,122