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Notes and Contracts Receivable (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Schedule of doubtful accounts
During the years ended December 31, 2017, 2016 and 2015, our allowance for doubtful accounts was as follows (amounts in thousands):
 
 
2017
 
2016
 
2015
Balance, beginning of period
 
$
5,378

 
$
6,470

 
$
7,110

Provision for losses
 
4,181

 
3,926

 
4,055

Write-offs
 
(4,014
)
 
(5,018
)
 
(4,695
)
Balance, end of period
 
$
5,545

 
$
5,378

 
$
6,470