Intangibles Assets and Goodwill - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill
Beginning of Year Balance	$ 611,982	$ 708,246	$ 749,762	$ 708,258	$ 708,258	$ 747,325
Additions						5,580
Reductions					(348,557)	(44,427)
Currency Translation Adjustments					70	(220)
End of Year Balance	359,771	611,982	708,258	611,982	359,771	708,258	$ 747,325
Accumulated impairment losses	167,900		167,900		167,900	167,900	167,900
Impairment of goodwill and other intangible assets	252,399	$ 97,158	48,127	97,158	349,557	48,127	69,437
ITPS
Goodwill
Beginning of Year Balance				571,575	571,575	566,215
Additions						5,580
Reductions					(317,525)
Currency Translation Adjustments					70	(220)
End of Year Balance	254,120		571,575		254,120	571,575	566,215
HS
Goodwill
Beginning of Year Balance				86,786	86,786	86,786
End of Year Balance	86,786		86,786		86,786	86,786	86,786
LLPS
Goodwill
Beginning of Year Balance				$ 49,897	49,897	94,324
Reductions			(44,400)		(31,032)	(44,427)
End of Year Balance	$ 18,865		$ 49,897		$ 18,865	$ 49,897	$ 94,324