Long Term Debt (Tables)

3 Months Ended

Mar. 31, 2020

Long-term Debt, Unclassified [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

Long-term debt as of March 31, 2020 and December 31, 2019 consists of the following (in thousands):

	March 31, 2020		December 31, 2019
6.0% Senior Notes	$	650,000	$	650,000
Convertible Notes:
3.25% Convertible Notes	402,499		402,500
1.75% Convertible Notes	550,000		550,000
Total Notes	1,602,499		1,602,500
Less: Unamortized discount	133,726		139,981
Deferred issuance costs	13,327		14,058
Total long-term debt	1,455,446		1,448,461
Less: current portion	—		385,532
Total long-term debt, less current portion	$	1,455,446	$	1,062,929