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Commitments and Contingencies Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]
The following table summarizes our principal contractual commitments, excluding open orders for purchases that support normal operations, as of March 31, 2017 (in thousands):
 
Payments Due By Period
 
Total
 
Remainder of 2017
 
2018
 
2019
 
2020
 
2021
Long-term debt obligations
$
75,000

 
$
—

 
$
—

 
$
—

 
$
75,000

 
$
—

Interest payments on long-term debt obligations
9,015

 
2,287

 
3,205

 
3,223

 
300

 
—

Operating lease obligations
26,547

 
6,375

 
8,133

 
5,515

 
3,312

 
3,212

Purchase obligations(1)
103,716

 
11,259

 
4,477

 
14,005

 
34,757

 
39,218

Total contractual obligations
$
214,278

 
$
19,921

 
$
15,815

 
$
22,743

 
$
113,369

 
$
42,430

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(1) Purchase obligations includes agreements to purchase goods that are enforceable and legally binding. These amounts are not accrued as of March 31, 2017. We are committed to make potential future milestone payments to third parties under distribution agreements. Payments under these agreements are contingent upon achievement of certain developmental, regulatory and/or commercial milestones and are not included in the table above.