Annual report pursuant to Section 13 and 15(d)

Debt - Inputs Used In Lattice Model (Details)

v3.6.0.2
Debt - Inputs Used In Lattice Model (Details) - Notes - Notes Due February 1, 2033 - $ / shares
1 Months Ended 12 Months Ended
Jan. 31, 2013
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 01, 2015
Debt Instrument [Line Items]          
Stock price (in dollars per share)   $ 9.3 $ 10.05 $ 9.99  
Conversion Rate 14.14827% 14.14827% 14.14827% 14.14827%  
Conversion price (in dollars per share) $ 7.07 $ 7.07 $ 7.07 $ 7.07 $ 7.07
Maturity date   Feb. 01, 2033 Feb. 01, 2033 Feb. 01, 2033  
Risk-free interest rate   1.22% 1.33% 1.40%  
Estimated stock volatility   47.00% 50.00% 39.00%  
Estimated credit spread   7.65% 11.42% 10.81%