XML 60 R39.htm IDEA: XBRL DOCUMENT v3.19.1
Debt - Additional Information (Details)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 14, 2018
USD ($)
day
Jul. 31, 2017
USD ($)
$ / shares
Jul. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
$ / shares
$ / share
shares
Mar. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Nov. 30, 2018
CAD ($)
Oct. 01, 2018
$ / shares
Sep. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2014
$ / shares
shares
Debt Instrument [Line Items]                        
Principal amount         $ 513,546,000 $ 513,546,000            
Share price (usd per share) | $ / shares                 $ 10.51      
Carrying amount         425,634,000 425,634,000       $ 416,883,000 $ 301,625,000  
Amount outstanding         $ 513,546,000 513,546,000       515,106,000 354,792,000  
2025 Convertible Notes                        
Debt Instrument [Line Items]                        
If-converted value in excess of principal amount           $ 0            
2024 Convertible Notes                        
Debt Instrument [Line Items]                        
Stated interest rate   2.875%                    
Principal amount   $ 143,750,000                    
Effective interest rate         9.00% 9.00%            
If-converted value in excess of principal amount           $ 0            
Convertible senior notes issued and settled   34,400,000                    
2019 Convertible Notes                        
Debt Instrument [Line Items]                        
Stated interest rate       2.125%                
Effective interest rate         8.00% 8.00%            
If-converted value in excess of principal amount           $ 0            
Convertible senior notes issued and settled     $ 30,000,000 $ 200,000,000                
Convertible senior notes repurchased and retired   $ 35,000,000.0                    
Common Stock Class A Non-voting | 2024 Convertible Notes                        
Debt Instrument [Line Items]                        
Conversion rate per $1,000 principal amount   100                    
Conversion price, per share (in dollars per share) | $ / shares   $ 10.00                    
Common Stock Class A Non-voting | 2019 Convertible Notes                        
Debt Instrument [Line Items]                        
Conversion rate per $1,000 principal amount       62.2471                
Conversion price, per share (in dollars per share) | $ / shares       $ 16.065                
Additional Paid-in Capital | 2024 Convertible Notes                        
Debt Instrument [Line Items]                        
Carrying amount         $ 25,300,000 25,300,000            
Senior Notes | 2025 Convertible Notes                        
Debt Instrument [Line Items]                        
Stated interest rate 2.375%                      
Principal amount $ 172,500,000       $ 172,500,000 $ 172,500,000            
Semi-annual stated rate 2.375%                      
Equity component of debt             $ 39,000,000.0          
Effective interest rate         9.00% 9.00%            
Conversion rate per $1,000 principal amount 62.8931                      
Conversion price, per share (in dollars per share) | $ / shares             $ 15.90          
Share price (usd per share) | $ / shares             $ 15.90          
Carrying amount         $ 122,918,000 $ 122,918,000       119,736,000 0  
Amount outstanding         172,500,000 172,500,000       172,500,000 0  
Senior Notes | 2024 Convertible Notes                        
Debt Instrument [Line Items]                        
Principal amount         143,750,000 143,750,000            
Carrying amount         108,533,000 108,533,000       105,858,000 103,287,000  
Amount outstanding         143,750,000 143,750,000       143,750,000 143,750,000  
Senior Notes | 2019 Convertible Notes Embedded Derivative                        
Debt Instrument [Line Items]                        
Carrying amount         0 0       2,552,000 16,042,000  
Amount outstanding         0 0       2,552,000 16,042,000  
Senior Notes | 2019 Convertible Notes                        
Debt Instrument [Line Items]                        
Principal amount         195,000,000 195,000,000            
Carrying amount         192,688,000 192,688,000       187,433,000 182,296,000  
Amount outstanding         195,000,000 195,000,000       195,000,000 195,000,000  
Receivables Securitization Facility | CASHMAX secured borrowing facility                        
Debt Instrument [Line Items]                        
Principal amount         1,105,000 1,105,000            
Carrying amount         304,000 304,000       0 0  
Amount outstanding         $ 1,105,000 $ 1,105,000       $ 0 $ 0  
Debt Conversion, Condition One | Senior Notes | 2025 Convertible Notes                        
Debt Instrument [Line Items]                        
Trading days threshold | day 20                      
Consecutive trading day threshold | day 30                      
2019 Convertible Notes Hedges — Level 2 | Common Stock Class A Non-voting                        
Debt Instrument [Line Items]                        
Notional amount (shares) | shares       12.1                
Strike price (dollars per share) | $ / share       16.065                
Net-share-settled Warrants | Common Stock Class A Non-voting                        
Debt Instrument [Line Items]                        
Number of securities called (shares) | shares                       12.1
Strike price for warrants (in dollars per share) | $ / shares                       $ 20.83
Variable Interest Entity, Primary Beneficiary | Receivables Securitization Facility | CASHMAX secured borrowing facility                        
Debt Instrument [Line Items]                        
Maximum borrowing amount               $ 25,000,000