Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of period - Net of Tax	$ 1,391,530	$ 1,519,286	$ 1,519,286
Balance at the end of period - Net of Tax	1,294,912	1,429,647	1,391,530
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of period - Net of Tax	(137,290)	(142,168)	(142,168)
ASU 2016-01 cumulative effect adjustment - Net of Tax		(381)	(381)
Other comprehensive income (loss) - Net of Tax	(21,828)	(969)	5,259
Balance at the end of period - Net of Tax	(159,118)	(143,518)	(137,290)
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of period - Gross	(137,389)	(142,574)	(142,574)
Other comprehensive income (loss) - Gross	(21,870)	(955)	5,185
Balance at the end of period - Gross	(159,259)	(143,529)	(137,389)
Unrealized Gain (Loss) on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at the beginning of period - Gross	131	537	537
Balance at the beginning of period - Tax	(32)	(131)	(131)
Balance at the beginning of period - Net of Tax	99	406	406
ASU 2016-01 cumulative effect adjustment - Gross		(504)	(504)
ASU 2016-01 cumulative effect adjustment - Tax		123	123
ASU 2016-01 cumulative effect adjustment - Net of Tax		(381)	(381)
Other comprehensive income (loss) - Gross	55	(18)	98
Other comprehensive income (loss) - Tax	(13)	4	(24)
Other comprehensive income (loss) - Net of Tax	42	(14)	74
Balance at the end of period - Gross	186	15	131
Balance at the end of period - Tax	(45)	(4)	(32)
Balance at the end of period - Net of Tax	$ 141	$ 11	$ 99