Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 136,576	$ 282,778	$ 78,306
Charged to expense - additions	2,124	4,552	204,472
Release of valuation allowance - deductions	(44,245)	(150,754)	0
Charged to expense - deductions	0	0	0
Balance at end of period	94,455	136,576	282,778
State operating loss carry-forwards
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	61,560	60,488	42,983
Charged to expense - additions	0	0	17,505
Release of valuation allowance - deductions	(13,596)	1,072	0
Charged to expense - deductions	0	0	0
Balance at end of period	47,964	61,560	60,488
Deferred deductible temporary differences
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	9,088	10,590	9,420
Charged to expense - additions	0	0	1,170
Release of valuation allowance - deductions	(9,088)	(1,502)	0
Charged to expense - deductions	0	0	0
Balance at end of period	0	9,088	10,590
Charitable Contributions
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	3,156	5,052	0
Charged to expense - additions	141	0	5,052
Release of valuation allowance - deductions	0	(1,896)	0
Charged to expense - deductions	0	0	0
Balance at end of period	3,297	3,156	5,052
162(m) Officers Compensation
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	5,957	0
Charged to expense - additions	0	0
Release of valuation allowance - deductions	(5,957)	5,957
Charged to expense - deductions	0	0
Balance at end of period	0	5,957	0
AMT Credit
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	12,413	166,798	0
Charged to expense - additions	1,983	0	166,798
Release of valuation allowance - deductions	(14,396)	(154,385)	0
Charged to expense - deductions	0	0	0
Balance at end of period	0	12,413	166,798
Foreign Tax Credits
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	44,402	39,850	25,903
Charged to expense - additions	0	4,552	13,947
Release of valuation allowance - deductions	(1,208)	0	0
Charged to expense - deductions	0	0	0
Balance at end of period	$ 43,194	$ 44,402	$ 39,850