Financing Arrangements (Tables)

6 Months Ended

Jun. 30, 2016

Debt Instrument [Line Items]

Schedule of Convertible Debt Interest Expense [Table Text Block]

During the three and six months endedJune 30, 2016, the Company recognized interest expense on the Notes as follows (in thousands):

Contractual interest expense based on 3.25% per annum	$	2,031
Amortization of debt discount	2,396
Total interest expense	$	4,427

Convertible Debt [Table Text Block]

The carrying amount of the Notes consisted of the following (in thousands):

	June 30, 2016
Liability component:
Principal amount	$	250,000
Less: debt discount	(75,985		)
Net carrying amount of liability component	$	174,015
Net carrying amount of equity component	$	68,658