Income Taxes Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 21, 2018
Valuation Allowance [Line Items]
Net Operating Loss - Federal	$ 124,341,000	$ 99,524,000
Reduction to total deferred tax asset		24,942,000	$ 6,714,000
Gross net operating loss, at 35%		71,263,000
Gross net operating loss, at 21%			31,969,000
Deferred tas asset, federal alternative minimum tax credit	102,482,000	188,080,000
Decrease in federal alternative minimum tax	85,598,000
Increase (decrease) in valuation allowance, federal alternative minimum tax credit	0	(9,088,000)
Valuation allowance, federal alternative minimum tax credit	47,964,000	61,560,000
Valuation allowance on foreign tax credits	43,194,000	44,402,000
Deferred tax asset related to state operating losses	110,339,000	107,756,000
Reduction in income tax expense due to non-controlling interest	(18,181,000)	0	$ 0
Tax Cuts And Jobs Act Of 2017, revaluation of deferred tax assets and liabilities, benefit		115,291,000
Tax Cuts and Jobs Act of 2017, AMT credit carryforward	12,413,000	154,385,000
Tax Cuts And Jobs Act Of 2017, federal net operating loss carryback		23,483,000
Unrecognized tax benefits that would impact effective tax rate	31,516,000	29,376,000
Increase in unrecognized tax benefits resulting from tax positions taken during prior periods	2,140,000	7,474,000
Reduction to unrecognized tax benefits, from position taken on state tax return	8,437,000	666,000
Accrued liability relating to uncertain tax positions	0	644,000
Interest income included in accrued interest liability	644,000	337,000
Accrued liabilities for tax penalties	0	0
Reduction to net operation loss, resulting from income tax examination				$ 108,651,000
Alternative Minimum Tax Credit
Valuation Allowance [Line Items]
Increase (decrease) in valuation allowance, federal alternative minimum tax credit	12,413,000
Deferred Equity Compensation, Section 162(m)
Valuation Allowance [Line Items]
Valuation allowance, federal alternative minimum tax credit		5,957,000
Charitable Contributions
Valuation Allowance [Line Items]
Valuation allowance, federal alternative minimum tax credit	$ 3,297,000	$ 3,156,000