Long-Term Debt - Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Jun. 30, 2018	Jun. 30, 2017
Long-term debt
Debt, gross		$ 897,287
Other			$ 735
Total debt, net		839,270	903,647
Less short-term borrowings and current portion of long-term debt		(66,845)	(60,117)
Total long-term debt, net		$ 772,425	843,530
Debt instrument, stated percentage		12.00%
Voluntary payment against long-term debt	$ 25,000
Write-off related to debt issuance costs	$ 2,600
Term Loan A due 2020
Long-term debt
Debt, gross		$ 227,276	254,375
Unamortized discount and other debt issuance costs		(10,178)	(16,238)
Total debt, net		$ 217,098	238,137
Debt instrument, stated percentage		6.84%
Term Loan B due 2022
Long-term debt
Debt, gross		$ 670,011	727,881
Unamortized discount and other debt issuance costs		(47,839)	(63,106)
Total debt, net		$ 622,172	$ 664,775
Debt instrument, stated percentage		7.47%