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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis
The table below sets forth our fair value hierarchy for our financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2020 and December 31, 2019.
Level 1Level 2Level 3Total
September 30, 2020
Assets:
Convertible debt investment$— $— $61,122 $61,122 
Deferred compensation assets— 30,477 — 30,477 
Total assets$— $30,477 $61,122 $91,599 
Liabilities:
Interest rate swaps$— $5,452 $— $5,452 
Total liabilities$— $5,452 $— $5,452 
December 31, 2019
Assets:
Convertible debt investment$— $— $49,542 $49,542 
Deferred compensation assets— 27,445 — 27,445 
Total assets$— $27,445 $49,542 $76,987 
Liabilities:
Interest rate swap$— $546 $— $546 
Total liabilities$— $546 $— $546 
Convertible senior notes  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
The table below sets forth the changes in the balance of the convertible debt investment for the nine months ended September 30, 2020.
Convertible Debt Investment
Balance as of December 31, 2019$49,542 
Purchases13,000 
Change in fair value of convertible debt investment(1,420)
Balance as of September 30, 2020$61,122