Basis of Financial Statement Presentation - ASC 606 Adjustments Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Assets
Account receivable, net	$ 163,398		$ 154,059
Total current assets	672,891		642,053
Other assets	45,595		16,770
Total assets	1,401,725		1,318,095
Liabilities and Stockholders' Equity
Accrued expenses	143,977		93,761
Total current liabilities	312,669		278,473
Deferred Tax Liabilities, Net, Noncurrent	12,875		8,806
Other non-current obligations	148,835		125,360
Total liabilities	750,808		678,680
Retained earnings (deficit)	223,472		204,195
Accumulated other comprehensive income (loss)	(44,073)		(30,724)
Total stockholders’ equity	650,917	$ 676,795	639,415	$ 512,571	$ 468,974	$ 463,875
Total liabilities and stockholders’ equity	$ 1,401,725		$ 1,318,095