SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Decrease in valuation allowance	$ (7,900)
Change in Estimate of Interest Deductions
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Decrease in valuation allowance		$ (5,400)
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	4,586	4,470	$ 11,558
Charged to Cost and Expenses	7,507	380	5,211
Due to Currency Translation Adjustments	370	(149)	524
Other	1,049	(115)	(12,823)
Balance at End of Period	13,512	4,586	4,470
Deferred Tax Assets - Valuation Allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	137,450	172,846	145,216
Charged to Cost and Expenses	(7,395)	(20,104)	32,785
Due to Currency Translation Adjustments	448	(8,612)	9,853
Other	(3,429)	(6,680)	(15,008)
Balance at End of Period	127,074	137,450	172,846
Valuation Allowance, Deferred Tax Asset, liquidation and Merger of Entities [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Decrease in valuation allowance	(5,600)
Capital Loss Carryforward
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Decrease in valuation allowance		$ (1,100)
Pension Adjustments
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Decrease in valuation allowance	(900)		(11,600)
Valuation Allowance, Deferred Tax Asset, Tax Credit [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Decrease in valuation allowance	$ (800)
US tax rate change
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Decrease in valuation allowance			$ (4,600)