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Fair Value Measurements (Narrative) (Details) - USD ($)
Mar. 31, 2019
Mar. 19, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities measured at fair value $ 0  
Convertible Subordinated Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Stated interest rate percentage 2.75% 2.75%
Long-term debt measured at fair value $ 6,800,000  
Senior Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Stated interest rate percentage 6.625%  
Long-term debt measured at fair value $ 332,400,000