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Debt - Additional Information (Details)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended
May 14, 2018
USD ($)
day
$ / shares
Jul. 31, 2017
USD ($)
$ / shares
Jul. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Jun. 15, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 30, 2018
CAD ($)
Debt Instrument [Line Items]                  
Principal amount         $ 317,696,000        
Share price (in dollars per share) | $ / shares         $ 6.46        
Carrying amount         $ 241,424,000 $ 238,594,000   $ 420,166,000  
Amount outstanding         317,696,000 317,976,000   513,668,000  
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%        
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%        
Convertible senior notes issued and settled     $ 30,000,000 $ 200,000,000          
Convertible senior notes repurchased and retired   $ 35,000,000.0              
Remaining aggregate principal amount repurchased             $ 195,000,000.0    
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              
Additional Paid-in Capital | 2024 Convertible Notes                  
Debt Instrument [Line Items]                  
Carrying amount         $ 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        
Semi-annual stated rate 2.375%                
Equity component of debt         $ 39,000,000.0        
Effective interest rate         9.00%        
Conversion rate per $1,000 principal amount 62.8931                
Conversion price, per share (in dollars per share) | $ / shares $ 15.90                
Share price (in dollars per share) | $ / shares $ 15.90                
Carrying amount         $ 127,902,000 126,210,000   121,316,000  
Amount outstanding         172,500,000 172,500,000   172,500,000  
Senior Notes | 2024 Convertible Notes                  
Debt Instrument [Line Items]                  
Principal amount         143,750,000        
Carrying amount         112,740,000 111,311,000   107,182,000  
Amount outstanding         143,750,000 143,750,000   143,750,000  
Senior Notes | 2019 Convertible Notes                  
Debt Instrument [Line Items]                  
Carrying amount         0 0   190,076,000  
Amount outstanding         0 0   195,000,000  
Receivables Securitization Facility | CASHMAX secured borrowing facility                  
Debt Instrument [Line Items]                  
Principal amount         404,000        
Carrying amount         (260,000) (19,000)   334,000  
Amount outstanding         $ 404,000 $ 634,000   $ 1,160,000  
Debt Conversion, Condition One | Senior Notes | 2025 Convertible Notes                  
Debt Instrument [Line Items]                  
Trading days threshold | day 20                
Consecutive trading day threshold | day 30                
Net-share-settled Warrants | Common Stock Class A Non-voting                  
Debt Instrument [Line Items]                  
Number of securities called (shares) | shares           14.3      
Strike price for warrants (in dollars per share) | $ / shares           $ 20.83      
Class of Warrant or Right, Outstanding | shares         5.0        
Variable Interest Entity, Primary Beneficiary | Receivables Securitization Facility | CASHMAX secured borrowing facility                  
Debt Instrument [Line Items]                  
Maximum borrowing amount                 $ 25,000,000