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Stock-Based Compensation (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) item shares	Jun. 30, 2019 USD ($)	Dec. 31, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $	$ 6,989	$ 11,664	$ 20,054	$ 24,492
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	7,758,000		7,758,000
Requisite service period			3 years 6 months
Awards granted			303,385
Performance Stock Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service period			3 years 6 months
Awards granted			249,564		155,872
Increase (decrease) in units			(40,509)
Performance Stock Units, Market Condition [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance issuance as percent or original grant, in the event of negative shareholder return			100.00%
Number of tranches \| item			5
Awards granted
Increase (decrease) in units			7,672
Performance Stock Units, Market Condition [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance issuance as percent or original grant			50.00%
Performance Stock Units, Market Condition [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance issuance as percent or original grant			175.00%