Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2019
Income Taxes [Line Items]
Effective income tax rate	26.70%	28.10%	37.10%	15.00%
Income before income taxes, domestic operations			$ (2,500)	$ 4,000
Income before income taxes, foreign operations			69,000	68,300
Liabilities for uncertain income tax positions	$ 57,600		57,600								$ 52,500
Cash paid for income taxes			8,900	$ 22,400
Prepaid tax payments	$ 3,700		$ 3,700								$ 3,700
California Franchise Tax Board [Member]
Income Taxes [Line Items]
Income Tax Examination, Year under Examination						2016	2015		2013	2012
Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Income Tax Examination, Year under Examination						2016	2015	2014	2013	2012
New York State Division of Taxation and Finance [Member]
Income Taxes [Line Items]
Income Tax Examination, Year under Examination					2017	2016	2015