Notes Payable - Convertible (Details) (USD $)
|
6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2014
|
Jun. 30, 2013
|
Jan. 31, 2013
2026 Notes
|
Jun. 30, 2014
2026 Notes
|
Jun. 30, 2013
2026 Notes
|
Jun. 30, 2014
2026 Notes
|
Jun. 30, 2013
2026 Notes
|
Dec. 31, 2012
2026 Notes
|
Jul. 11, 2013
2028 Notes
|
Jun. 30, 2014
2028 Notes
|
Sep. 30, 2013
2028 Notes
|
Jun. 30, 2014
2028 Notes
|
Dec. 31, 2013
2028 Notes
|
Dec. 31, 2012
2028 Notes
|
Jun. 30, 2013
Convertible Debt
2028 Notes
|
Jun. 30, 2013
Convertible Debt
2028 Notes
|
Dec. 31, 2013
Common Stock
|
|
Debt Instrument [Line Items] | |||||||||||||||||
Stated interest rate | 3.95% | 3.95% | 5.125% | 5.125% | |||||||||||||
Noncash interest charges | $ 2,516,000 | $ 5,374,000 | |||||||||||||||
Contractual interest expense | 614,000 | 2,591,000 | 950,000 | 2,072,000 | |||||||||||||
Amortization of debt costs | 260,000 | 566,000 | |||||||||||||||
Total interest expense | 137,000 | 0 | 0 | 0 | 0 | 0 | 0 | 195,000 | 3,726,000 | 8,012,000 | |||||||
Outstanding principal balance | 15,537,000 | 223,035,000 | |||||||||||||||
Repayments of convertible debt | 0 | 20,656,000 | 20,702,000 | 226,427,000 | |||||||||||||
Settled | 15,537,000 | 130,000 | 222,905,000 | 223,035,000 | |||||||||||||
Decrease to APIC, conversion of debt | $ 5,028,000 | $ 3,197,000 | |||||||||||||||
Conversion period based on average daily closing price | 20 days | ||||||||||||||||
Shares of common stock | 2,407,911 |