Notes and Other Receivables (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 121,557	$ 40,970
Secured Note Receivable, 10.00% Interest Rate, Due May 2021 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 13,416	0
Stated interest rate	10.00%
Secured Note Receivable, 10.75% Interest Rate, Due September 2020 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 28,532	17,685
Stated interest rate	10.75%
Secured Note Receivable, 9.5% Interest Rate, Due October 2019 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 6,599	6,593
Stated interest rate	9.50%
Secured Note Receivable, 3.5% Interest Rate, Due December 16, 2017 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 55,000	0
Stated interest rate	3.50%
Notes and Other Receivables from Affiliates [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 3,981	4,695
Other Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 14,029	$ 11,997