Restructuring and Related Reorganization Costs - Reserve (Details) - Corporate Restructuring Plan - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Balance at beginning of period		$ 2,354,000	$ 2,354,000
Costs Incurred	$ 0	0	3,726,000
Cash Payments			(6,080,000)
Balance at end of period	$ 0		0
Retention and personnel liability
Restructuring Reserve [Roll Forward]
Balance at beginning of period		1,956,000	1,956,000
Costs Incurred			2,418,000
Cash Payments			(4,374,000)
Balance at end of period			0
Other liability
Restructuring Reserve [Roll Forward]
Balance at beginning of period		$ 398,000	398,000
Costs Incurred			1,308,000
Cash Payments			(1,706,000)
Balance at end of period			$ 0