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Schedule of Notes Payable (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Notes payable $ 554,539 $ 475,195
Revolving Credit Facility    
Debt Instrument [Line Items]    
Notes payable 487,304 394,714
Debt issuance costs 7,696 5,286
Convertible Debt    
Debt Instrument [Line Items]    
Notes payable 67,235 80,481
Debt issuance costs 617 1,014
Unamortized discount $ 2,109 $ 3,505