Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Narrative) (Details)

v3.8.0.1
Commitments and Contingencies (Narrative) (Details)
Apr. 26, 2017
USD ($)
Apr. 04, 2017
year
$ / shares
Apr. 12, 2017
USD ($)
Business Acquisition, Equity Interests Issued or Issuable [Line Items]      
Consideration per share (USD per share)   $ 32.50  
Liberty Ventures reference price (USD per share)   $ 43.65  
Years to redemption date | year   21  
Senior Notes | Senior Notes Due 2021      
Business Acquisition, Equity Interests Issued or Issuable [Line Items]      
Aggregate principal amount of consent received | $     $ 312,418,000
Percent of total consent received     96.13%
Aggregate consent fee | $ $ 812,500    
Senior Notes | Senior Notes Due 2025      
Business Acquisition, Equity Interests Issued or Issuable [Line Items]      
Aggregate principal amount of consent received | $     $ 443,538,000
Percent of total consent received     98.56%
Aggregate consent fee | $ $ 1,125,000    
Minimum      
Business Acquisition, Equity Interests Issued or Issuable [Line Items]      
Series A preferred shares dividend rate   5.00%  
Maximum      
Business Acquisition, Equity Interests Issued or Issuable [Line Items]      
Series A preferred shares dividend rate   7.00%  
Series A Cumulative Redeemable Preferred Stock      
Business Acquisition, Equity Interests Issued or Issuable [Line Items]      
Initial liquidation price (USD per share)   $ 25.00  
Common Stock      
Business Acquisition, Equity Interests Issued or Issuable [Line Items]      
Ratio of new stock received   0.63  
Consideration per share (USD per share)   $ 27.50  
Preferred Stock      
Business Acquisition, Equity Interests Issued or Issuable [Line Items]      
Ratio of new stock received   0.20  
Consideration per share (USD per share)   $ 5.00