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 |