XML 128 R113.htm IDEA: XBRL DOCUMENT v3.6.0.2
Writedowns and Other Charges - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Mar. 13, 2015
Jul. 01, 2013
Jun. 05, 2013
Writedown Of Asset And Lease Loss Accrual [Line Items]              
Lease loss due to excess capacity $ 600,000            
Writedown of assets   $ 15,900,000          
Writedown of assets and other real estate related charges $ 0 56,642,000 $ 8,625,000        
Senior Secured Notes              
Writedown Of Asset And Lease Loss Accrual [Line Items]              
Writedown of capitalized debt costs     9,600,000        
Early principal payments     235,000,000        
Senior Secured Notes | 8.25% Senior Secured Notes              
Writedown Of Asset And Lease Loss Accrual [Line Items]              
Writedown of capitalized debt costs   8,500,000          
Payment of make whole premium   16,500,000          
Aggregate principal amount   $ 305,000,000.0     $ 305,000,000.0   $ 305,000,000.0
Interest rate (percent) 8.25% 8.25%   8.25% 8.25% 8.25% 8.25%
Excess Real Estate Capacity              
Writedown Of Asset And Lease Loss Accrual [Line Items]              
Writedown of assets and other real estate related charges     $ 8,600,000        
Trading Rights and Fixed Assets              
Writedown Of Asset And Lease Loss Accrual [Line Items]              
Writedown of assets $ 1,500,000            
Jersey, New York, Chicago and Greenwich | Early Lease Termination              
Writedown Of Asset And Lease Loss Accrual [Line Items]              
Early lease termination charges   $ (23,700,000)          
Jersey City and Chicago | Leasehold Improvements and Fixed Assets              
Writedown Of Asset And Lease Loss Accrual [Line Items]              
Writedown of fixed assets and loss from sale of microwave communication related assets   $ 17,000,000