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Notes and Contracts Receivable (Tables)
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Schedule of doubtful accounts
During the years ended December 31, 2016, 2015 and 2014, our allowance for doubtful accounts was as follows (amounts in thousands):
 
 
2016
 
2015
 
2014
Balance, beginning of period
 
$
6,470

 
$
7,110

 
$
7,927

Provision for losses
 
3,926

 
4,055

 
4,209

Write-offs
 
(5,018
)
 
(4,695
)
 
(5,026
)
Balance, end of period
 
$
5,378

 
$
6,470

 
$
7,110