Annual report pursuant to Section 13 and 15(d)

Related Party Transactions (Details)

v3.6.0.2
Related Party Transactions (Details) - USD ($)
1 Months Ended 12 Months Ended
Jul. 11, 2016
Jan. 01, 2001
Feb. 02, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2001
Apr. 30, 2008
Dec. 31, 1991
Related Party Transaction [Line Items]                  
Stock Repurchased and Retired During Period, Value       $ 58,679,000 $ 53,774,000 $ 6,850,000      
Immediate Family Member of Management or Principal Owner [Member] | Property                  
Related Party Transaction [Line Items]                  
Capital lease obligations                 $ 900,000
Immediate Family Member of Management or Principal Owner [Member] | Capital Lease Obligation Addition                  
Related Party Transaction [Line Items]                  
Capital lease obligations               $ 1,300,000  
Chief Executive Officer [Member] | Second Aircraft                  
Related Party Transaction [Line Items]                  
Termination period on lease   12 months              
Monthly lease payment   $ 132,000              
Capital lease deposit             $ 1,500,000    
Deposit termination period             6 months    
ACS                  
Related Party Transaction [Line Items]                  
Payments to related party     $ 6,200,000     62,900,000      
Receipts from Related Parties     $ 8,100,000     $ 50,900,000      
Class A Common Stock | Investor [Member]                  
Related Party Transaction [Line Items]                  
Stock Repurchased and Retired During Period, Shares 1,000,000                
Stock Repurchased and Retired During Period, Value $ 16,100,000