Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Debt consists of the following (in thousands):

	September 30, 2017			December 31, 2016
Convertible senior notes at 5.00%, due in February 2021	$	120,483		$	115,159
Convertible senior notes at 4.50%, due in June 2022	88,317			—
Convertible senior subordinated debentures at 4.125%, due in February 2027	—			13,039
Other notes and lease obligations	32,052			33,151
	240,852			161,349
Less current maturities of long-term debt	(1,940		)	(15,261		)
Long-Term Debt	$	238,912		$	146,088

Schedule of Convertible Debt

The liability components of the debentures consisted of the following (in thousands):

	December 31, 2016
Principal amount of liability component	$	13,350
Unamortized discount	(311		)
Net carrying amount of liability component	$	13,039

Liability Components of Convertible 2021 Note

The liability components of the 2021 notes consist of the following (in thousands):

	September 30, 2017			December 31, 2016
Principal amount of liability component	$	150,000		$150,000
Unamortized discount	(25,473		)	(29,919		)
Debt fees	(4,044		)	(4,922		)
Net carrying amount of liability component	$	120,483		$	115,159

Liability Components of Convertible 2022 Note

The liability components of the 2022 notes consist of the following (in thousands):

	September 30, 2017
Principal amount of liability component	$	120,000
Unamortized discount	(27,522		)
Debt fees	(4,161		)
Net carrying amount of liability component	$	88,317