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Long-Term Debt and Lines of Credit - Summary (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019
Long-term debt
Long term debt gross	$ 722,064
Less debt issuance costs	(9,319)	$ (9,965)
Total long-term debt	712,745	701,913
Less current portion of long-term debt, including accrued interest(1) of $4.1 million as of December 31, 2019	(4,628)	(8,744)
Total long-term debt, long-term portion	708,117	693,169
Accrued interest		4,100
Accrued Liabilities Current
Long-term debt
Accrued interest	500
Senior Secured Credit Facilities \| Term loan
Long-term debt
Face amount of debt			$ 665,000
Senior Secured Credit Facilities \| Credit Facility
Long-term debt
Commitments			$ 200,000
First lien senior secured credit facility \| Term loan
Long-term debt
Long term debt gross	646,114	650,891
First lien senior secured credit facility \| Credit Facility
Long-term debt
Long term debt gross	$ 75,950	$ 60,987