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Compensation Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
2019 Executive Management Incentive Plan [Member]          
Compensation Plans (Details) [Line Items]          
Compensation Arrangement by Cash and Share-based Payment Award, Component Description     The operational performance metrics are equally weighted and account for 50% of the total target incentive compensation. The shareholder return metrics are weighted 75% for relative shareholder return metrics and 25% for total shareholder return metrics, and account for 50% of the total target incentive compensation    
Labor and Related Expense $ 2,500   $ 4,700    
Accrued Bonuses, Current 4,700   $ 4,700    
Portion of Awards Paid in Cash     25.00%    
Portion of Awards Issued in Equity     75.00%    
2019 Executive Management Incentive Plan [Member] | Equity Awards Vesting at the End of 2019 [Member]          
Compensation Plans (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Portion     two-thirds    
2019 Executive Management Incentive Plan [Member] | Equity Awards Vesting in December 2020 [Member]          
Compensation Plans (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Portion     one-third    
2018 Executive Management Incentive Plan [Member]          
Compensation Plans (Details) [Line Items]          
Labor and Related Expense   $ 1,800   $ 3,700  
Share Based Compensation [Member] | 2018 Executive Management Incentive Plan [Member] | Equity Awards Issued in the First Quarter of 2019 [Member]          
Compensation Plans (Details) [Line Items]          
Accrued Bonuses, Share Based Compensation, Current         $ 2,400
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount         200
Potential Aggregate Payout [Member] | 2019 Executive Management Incentive Plan [Member] | Minimum [Member]          
Compensation Plans (Details) [Line Items]          
Labor and Related Expense     $ 0    
Potential Aggregate Payout [Member] | 2019 Executive Management Incentive Plan [Member] | Maximum [Member]          
Compensation Plans (Details) [Line Items]          
Labor and Related Expense     18,000    
One-Time Separation Payment [Member] | Retirement of Executive Vice President and Chief Legal Officer [Member]          
Compensation Plans (Details) [Line Items]          
Labor and Related Expense     500    
Restricted Stock Vesting on December 13, 2019 [Member] | Share Based Compensation [Member] | 2018 Executive Management Incentive Plan [Member] | Equity Awards Issued in the First Quarter of 2019 [Member]          
Compensation Plans (Details) [Line Items]          
Share-based Payment Arrangement, Expense $ 40   $ 100    
Restricted Shares Vesting on December 14, 2018 [Member] | Share Based Compensation [Member] | 2017 Executive Management Incentive Plan [Member] | Equity Awards Issued in First Quarter of 2018 [Member]          
Compensation Plans (Details) [Line Items]          
Share-based Payment Arrangement, Expense   $ 300   $ 600 $ 1,200