Senior Notes, Convertible Notes and Trust Preferred Securities - Schedule of Maturities of Long-term Debt (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (7,126)
Senior Notes, Convertible Notes, and Trust Preferred Securities [Member]
Debt Instrument [Line Items]
2017	0
2018	0
2019	0
2020	0
2021	0
Thereafter	629,120
Long-term debt, gross	629,120
Unamortized debt discounts	(1,780)
Unamortized debt issuance costs	(5,882)
Long-term debt	$ 621,458

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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