Income Taxes (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Statutory federal income tax rate	21.00%	35.00%	35.00%
Discrete tax benefit adjustment		$ 19,300
Discrete income tax provision adjustment related to vesting of restricted stock	$ 5,100
Tax expense related to executive compensation	1,300
Provisional expense	500
Deferred tax assets, valuation allowance	445	3,994
Capital loss carryforwards	56
Total net income tax (refunds) payments	18,000	98,000	$ (42,400)
Unrecognized tax benefits	2,215,000	2,215,000	$ 2,215,000
Accrued interest and penalties	$ 263	$ 193
Earliest tax year
Operating Loss Carryforwards [Line Items]
Statutory federal income tax rate	35.00%
Latest tax year
Operating Loss Carryforwards [Line Items]
Statutory federal income tax rate	21.00%
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards related to state income taxes	$ 27,600
Deferred tax assets, valuation allowance	$ 390