Annual report pursuant to Section 13 and 15(d)

SENIOR AND CONVERTIBLE SENIOR NOTES - Schedule of Principal Maturities of Senior and Senior Convertible Notes (Details)

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SENIOR AND CONVERTIBLE SENIOR NOTES - Schedule of Principal Maturities of Senior and Senior Convertible Notes (Details) - Senior and senior convertible notes [Member]
$ in Thousands
Dec. 31, 2015
USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]  
2016 $ 0
2017 126,500
2018 175,000
2019 0
2020 300,000
Thereafter 500,000
Total $ 1,101,500