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Financing Arrangements (Tables)
 12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Summary of carrying values and coupon rates on financing arrangements
The carrying values and the fixed contractual coupon rates of the Company's financing arrangements are as follows (dollars in thousands):
 
December 31, 2014

 
December 31, 2013

Convertible notes payable, 2.16% to 3.84%, due 2015, VIE
$
334

 
$
—

Current portion notes payable, 8.64%, due August 1, 2014
—

 
6,642

Current portion notes payable, 8.90%, due August 1, 2014
—

 
2,467

Total current portion of notes payable
$
334

 
$
9,109

2019 Convertible Senior Notes
 
 
 
     Principal amount outstanding
$
245,000

 
$
—

     Unamortized discount
(49,092
)
 
—

          Net carrying amount
195,908

 
—

Total long-term portion of notes payable
$
195,908

 
$
—
Schedule of principal payments on long-term debt obligations
rincipal payments on long-term debt obligations of $245.0 million in 2019.