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Fair Value of Financial Instruments - Schedule of Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Financial liabilities:    
Notes payable $ 175,181 $ 39,235
Notes payable, fair value 175,181 39,235
Long-term debt, gross 1,105,776 925,398
Subordinated amortizing notes    
Financial liabilities:    
Long-term debt, gross 14,066 20,717
Long-term debt, fair value 12,122 20,717
5 3/4% Senior Notes due 2019    
Financial liabilities:    
Long-term debt, gross 148,295 147,766
Long-term debt, fair value 147,750 149,250
8 1/2% Senior Notes due 2020    
Financial liabilities:    
Long-term debt, gross 422,896 422,889
Long-term debt, fair value 449,438 462,410
7% Senior Notes due 2022    
Financial liabilities:    
Long-term debt, gross 345,338 294,791
Long-term debt, fair value $ 350,875 $ 300,750