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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 07, 2018
Aug. 06, 2018
Jul. 02, 2018
Apr. 04, 2018
Aug. 07, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Aug. 03, 2017
Nov. 30, 2015
Subsequent Event [Line Items]                        
Principal amount outstanding           $ 44,156 $ 213,985 $ 44,156 $ 213,985 $ 89,144    
Debt instrument, interest rate                   1.60%    
Dividends declared (in dollars per share)           $ 0.02 $ 0.02 $ 0.04 $ 0.04      
Quarterly Dividend [Member]                        
Subsequent Event [Line Items]                        
Dividends declared (in dollars per share)               $ 0.04 $ 0.04      
Quarterly Dividend Declared in Q2 2018 [Member]                        
Subsequent Event [Line Items]                        
Dividends declared (in dollars per share)           $ 0.02            
Dividends payable date           Jul. 02, 2018            
Restricted Stock Awards [Member]                        
Subsequent Event [Line Items]                        
Number of shares authorized for granting (in shares)       270,500                
Restricted Stock Awards [Member] | Vesting after Third Anniversary Date [Member]                        
Subsequent Event [Line Items]                        
Award vesting percentage               30.00%        
Restricted Stock Awards [Member] | Vesting after Fifth Anniversary Date [Member]                        
Subsequent Event [Line Items]                        
Award vesting percentage               70.00%        
Loan from GGCP [Member]                        
Subsequent Event [Line Items]                        
Debt instrument, maturity date               Feb. 28, 2018        
AC 4% PIK Note [Member]                        
Subsequent Event [Line Items]                        
Prepayment of debt             $ 10,000   $ 20,000      
Principal amount outstanding           $ 20,000 $ 80,000 $ 20,000 $ 80,000 $ 50,000    
Debt instrument, interest rate           4.00%   4.00%       4.00%
Debt instrument, maturity date               Nov. 30, 2020        
AC 4% PIK Note [Member] | Principal Amount Due on November 30, 2020 [Member]                        
Subsequent Event [Line Items]                        
Principal amount outstanding           $ 0   $ 0        
Subsequent Event [Member]                        
Subsequent Event [Line Items]                        
Stock repurchased (in shares)         28,282              
Average price per share of repurchased shares (in dollars per share)         $ 26.41              
Additional shares authorized to be issued (in shares) 610,511                      
Shares available to be repurchased under the plan (in shares)                     1,000,000  
Subsequent Event [Member] | Quarterly Dividend Declared in Q2 2018 [Member]                        
Subsequent Event [Line Items]                        
Dividends declared (in dollars per share) $ 0.02                      
Dividends declared date Aug. 07, 2018                      
Dividends payable date Sep. 25, 2018                      
Dividends record date Sep. 10, 2018                      
Subsequent Event [Member] | Restricted Stock Awards [Member]                        
Subsequent Event [Line Items]                        
Number of shares authorized for granting (in shares) 162,450                      
Subsequent Event [Member] | Restricted Stock Awards [Member] | Vesting after Third Anniversary Date [Member]                        
Subsequent Event [Line Items]                        
Award vesting percentage 30.00%                      
Subsequent Event [Member] | Restricted Stock Awards [Member] | Vesting after Fifth Anniversary Date [Member]                        
Subsequent Event [Line Items]                        
Award vesting percentage 70.00%                      
Subsequent Event [Member] | Restricted Stock Awards [Member] | Mr. Gabelli [Member]                        
Subsequent Event [Line Items]                        
Reduction of RSU expense due to cap and waiver of receipt of deferred compensation expense     $ (8,600)                  
Subsequent Event [Member] | Restricted Stock Awards [Member] | Award Granted for FH 2017 [Member] | Mr. Gabelli [Member]                        
Subsequent Event [Line Items]                        
Deferred compensation agreement, value of shares issued     $ 36,900                  
Deferred compensation agreement, shares issued (in shares)     1,244,018                  
Reduction of RSU expense due to waiver of receipt of deferred compensation expense     $ (6,000)                  
Forfeited (in shares)     202,295                  
Deferred compensation arrangement, number of shares paid after waive off (in shares)     1,041,723                  
Payments for compensation agreement     $ 28,300                  
Subsequent Event [Member] | AC 4% PIK Note [Member]                        
Subsequent Event [Line Items]                        
Prepayment of debt   $ 10,000                    
Subsequent Event [Member] | AC 4% PIK Note [Member] | Principal Amount Due on November 30, 2020 [Member]                        
Subsequent Event [Line Items]                        
Prepayment of debt   10,000                    
Principal amount outstanding   $ 10,000                    
Debt instrument, interest rate   4.00%                    
Debt instrument, maturity date   Nov. 30, 2020