Long-Term Debt - Schedule of Long-Term Debt (Details) $ in Thousands, $ in Millions	Mar. 31, 2019 USD ($)	Mar. 31, 2019 TWD ($)	Dec. 31, 2018 USD ($)	May 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 1,564,751		$ 1,567,115
Discount	(7,129)		(7,395)
Debt Issuance Costs	(26,115)		(27,101)
Total	1,531,507		1,532,619
Capital lease obligation	1,143		1,184
Less current portion of total debt	120,255		45,321
Long-term debt, noncurrent maturities	1,444,496		1,521,794
Long-term debt	1,411,252		1,487,298
KFPC Loan Agreement
Debt Instrument [Line Items]
Total debt	96,093	$ 3,000.0	112,489
Discount	0		0
Debt Issuance Costs	(71)		(94)
Total	96,022		112,395
KFPC Revolving Facilities
Debt Instrument [Line Items]
Total debt	23,991	$ 740.0	13,012
Discount	0		0
Debt Issuance Costs	0		0
Total	23,991		13,012
5.25% Senior Notes
Debt Instrument [Line Items]
Debt instrument interest rate				5.25%
ABL Facility
Debt Instrument [Line Items]
Total debt	24,500		5,000
Discount	0		0
Debt Issuance Costs	0		0
Total	24,500		5,000
Term Loan | USD Tranche
Debt Instrument [Line Items]
Total debt	362,000		362,000
Discount	(7,129)		(7,395)
Debt Issuance Costs	(9,814)		(10,171)
Total	345,057		344,434
Term Loan | Euro Tranche
Debt Instrument [Line Items]
Total debt	336,750		342,900
Discount	0		0
Debt Issuance Costs	(4,455)		(4,711)
Total	332,295		338,189
Senior Notes | 7.0% Senior Notes
Debt Instrument [Line Items]
Total debt	394,750		399,060
Discount	0		0
Debt Issuance Costs	(6,428)		(6,622)
Total	388,322		392,438
Debt instrument interest rate					7.00%
Senior Notes | 5.25% Senior Notes
Debt Instrument [Line Items]
Total debt	325,524		331,470
Discount	0		0
Debt Issuance Costs	(5,347)		(5,503)
Total	$ 320,177		$ 325,967