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Debt - Mid Pac Term Loan (Details) - USD ($) $ in Thousands		12 Months Ended
Debt - Mid Pac Term Loan (Details) - USD ($) $ in Thousands	Sep. 27, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Proceeds from issuance of debt		$ 118,741	$ 616,706	$ 354,682
Term Loan \| Mid Pac Term Loan
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 1,500
Debt instrument, interest rate	4.375%