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Senior Notes, Convertible Notes and Trust Preferred Securities - Schedule of Maturities of Long-term Debt (Details) - Senior Notes, Convertible Notes, Exchangeable Notes, and Trust Preferred Securities [Member]
$ in Thousands
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]  
2016 $ 0
2017 12,400 [1]
2018 0
2019 0
2020 0
Thereafter 629,120
Long-term debt, gross 641,520
Debt discounts (2,273)
Long-term debt $ 639,247
[1] Although the 6.00% Convertible Guaranteed Notes mature in 2030, the notes can be put to the Company in 2017.