Debt Obligations (Tables)

12 Months Ended

Dec. 31, 2018

Debt Instrument [Line Items]

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

Debt obligations consist of the following as of December 31, 2018 and 2017:

	As of December 31,
(in thousands)	2018			2017
Credit Facility:
Revolving credit agreements	$	215,725		$	3,000
Term loan, due 2019	—			51,094
	215,725			54,094
Convertible Debt:
1.50% convertible notes, unsecured, due 2044	379,859			369,259
Other obligations	38,513			27,763
Total debt obligations	$	634,097		$	451,116
Unamortized debt issuance costs	(6,298		)	(5,816		)
Carrying value of debt	$	627,799		$	445,300
Short-term debt obligations and current maturities of long-term debt obligations	(38,017		)	(41,288		)
Long-term debt obligations	$	589,782		$	404,012