Income Taxes (Effective Income Tax Expense (Benefit) Rate) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax [Line Items]
Federal statutory tax expense (benefit) rate	21.00%	21.00%	35.00%
State tax expense (benefit), net of federal benefit	2.80%	17.00%	(6.00%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%	0.00%	(168.80%)
Effective Income Tax Rate Reconciliation Change in Deferred Tax Assets, Valuation Allowance Due to Tax Rate Change	0.00%	0.00%	168.80%
Valuation allowances	(11.20%)	(31.70%)	(33.00%)
Effective Income Tax Rate Reconciliation Change in Deferred Tax Assets, Valuation Allowance Due to Foreign Taxes	0.00%	(138.30%)	0.50%
Effective Income Tax Rate Reconciliation, Decrease in foreign NOL Due to Change In Ownership	0.00%	202.30%	0.00%
Foreign taxes	0.20%	6.60%	(2.00%)
Change in unrecognized tax benefits	0.00%	(8.00%)	5.10%
Effective Income Tax Rate Reconciliation Nondeductible Expense Disallowed Compensation	0.00%	7.70%	(0.60%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent	0.00%	(1.50%)	(0.90%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent	0.10%	1.40%	(0.80%)
Effective Tax Rate Reconciliation, Merger Related Fees/Expense	0.00%	12.70%	0.00%
Effective Income Tax Rate Reconciliation, Depletion In Excess Of Basis	(0.30%)	(4.00%)	0.00%
Permanent differences and other items	(1.30%)	1.30%	0.30%
Effective income tax expense (benefit) rate	11.30%	86.50%	(2.40%)