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Credit Facilities (3.25% Convertible Senior Notes due 2020) (Details)
3 Months Ended 6 Months Ended
Apr. 03, 2019
USD ($)
day
Nov. 02, 2015
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
day
Jun. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Aug. 09, 2018
USD ($)
Dec. 10, 2013
Debt Instrument [Line Items]                  
Gain (loss) on extinguishment of debt     $ (11,756,000) $ 0 $ (11,756,000) $ (2,270,000)      
Convertible Senior Notes Due 2020                  
Debt Instrument [Line Items]                  
Debt instrument, stated interest rate               3.25%  
Debt instrument face amount               $ 40,500,000.0  
Convertible notes | Convertible Senior Notes Due 2020                  
Debt Instrument [Line Items]                  
Debt instrument, stated interest rate   3.25%              
Debt instrument face amount   $ 125,000,000              
Periodic payment, principal         $ 0        
Debt instrument, unamortized discount   $ 2,900,000              
Holding threshold to declare debt due         25.00%        
Conversion price | $ / shares   $ 111.82              
Convertible debt, conversion ratio   8.9431              
Redemption price, percentage         100.00%        
Convertible debt redemption, consecutive trading days threshold | day         30        
Fair value disclosure   $ 97,800,000              
Beneficial conversion feature   27,200,000              
Gain (loss) on extinguishment of debt     17,500,000            
Decrease in debt carrying value     17,500,000            
Convertible notes payable     10,400,000   $ 10,400,000        
Debt issuance costs, gross     100,000   100,000        
Convertible notes | Convertible Senior Notes Due 2020 | Minimum                  
Debt Instrument [Line Items]                  
Periodic payment, interest         700,000        
Convertible notes | Convertible Senior Notes Due 2020 | Maximum                  
Debt Instrument [Line Items]                  
Periodic payment, interest         $ 800,000        
Convertible notes | Convertible Senior Notes Due 2020 | Debt Instrument, Redemption, Period One                  
Debt Instrument [Line Items]                  
Threshold trading days | day         30        
Convertible notes | Convertible Senior Notes Due 2020 | Debt Instrument, Redemption, Period Two                  
Debt Instrument [Line Items]                  
Threshold trading days | day         2        
Convertible notes | Convertible Senior Notes due 2018                  
Debt Instrument [Line Items]                  
Debt instrument, stated interest rate                 2.25%
Convertible notes | 5% Note                  
Debt Instrument [Line Items]                  
Debt instrument, stated interest rate 5.00%           5.00%    
Debt instrument face amount $ 25,000,000.0                
Convertible debt, conversion ratio 0.15129                
Convertible debt redemption, consecutive trading days threshold | day 5                
Convertible notes payable     25,800,000   $ 25,800,000        
Debt issuance costs, gross     $ 500,000   500,000        
Convertible notes | 5% Note | Minimum                  
Debt Instrument [Line Items]                  
Periodic payment, interest         4,600,000        
Convertible notes | 5% Note | Maximum                  
Debt Instrument [Line Items]                  
Periodic payment, interest         $ 15,500,000        
Convertible Condition One | Convertible notes | Convertible Senior Notes Due 2020                  
Debt Instrument [Line Items]                  
Threshold trading days | day         20        
Convertible debt redemption, consecutive trading days threshold | day         30        
Convertible debt redemption, percentage of stock price trigger         130.00%        
Convertible Condition Two | Convertible notes | Convertible Senior Notes Due 2020                  
Debt Instrument [Line Items]                  
Convertible debt redemption, percentage of stock price trigger         98.00%        
Threshold business days         5 days        
Threshold consecutive business days         5 days        
Convertible Condition Three | Convertible notes | Convertible Senior Notes Due 2020                  
Debt Instrument [Line Items]                  
Threshold trading days | day         2        
Other Assets | Convertible notes | Convertible Senior Notes Due 2020                  
Debt Instrument [Line Items]                  
Debt instrument, unamortized discount   3,700,000              
Additional Paid-In Capital | Convertible notes | Convertible Senior Notes Due 2020                  
Debt Instrument [Line Items]                  
Debt instrument, unamortized discount   $ 800,000              
Revolving loan facility                  
Debt Instrument [Line Items]                  
Debt instrument, stated interest rate             5.50%    
Revolving loan facility | Amended and Restated Facility Agreement                  
Debt Instrument [Line Items]                  
Debt instrument face amount               $ 40,500,000.0  
Two Investors | Convertible notes | Convertible Senior Notes Issued November, 2015                  
Debt Instrument [Line Items]                  
Debt instrument face amount             $ 73,400,000.0    
Two Investors | Convertible notes | 5% Note                  
Debt Instrument [Line Items]                  
Debt instrument face amount $ 42,000,000.0