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Senior Convertible Notes (Tables)
 3 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]  
Schedule of activity and balances associated with the Notes and related deferred transaction costs
A summary of quarterly activity and balances associated with the Notes and related deferred debt costs is presented below ($ in thousands):
 
Notes Balance
 
Deferred Debt Costs
 
Notes, net of
Deferred Debt Costs
Balance December 31, 2015
159,011

 
7,770

 
151,241

Less: amortization three months ended March 31, 2016 (1)
 
 
(4,153
)
 
4,153

Conversions
(79,829
)
 
—

 
(79,829
)
Balance, March 31, 2016
79,182

 
3,617

 
75,565

Less: amortization three months ended June 30, 2016
 
 
(253
)
 
253

Balance, June 30, 2016
79,182

 
3,364

 
75,818

Less: amortization three months ended September 30, 2016
 
 
(252
)
 
252

Balance, September 30, 2016
79,182

 
3,112

 
76,070

Less: amortization three months ended December 31, 2016 (1)
 
 
(2,263
)
 
2,263

Conversions
(55,668
)
 
—

 
(55,668
)
Balance, December 31, 2016
23,514

 
849

 
22,665

Deferred financing cost related to debt modification on February 28, 2017
 
 
1,591

 
(1,591
)
Less: amortization three months ended March 31, 2017 (1)
 
 
(608
)
 
608

Conversions
(4,911
)
 
—

 
(4,911
)
Balance, March 31, 2017
$
18,603

 
$
1,832

 
$
16,771

_____________________
(1) Includes accelerated amortization of deferred debt costs attributable to conversions and exchanges