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Notes and Contracts Receivable Notes and Contracts Receivable (Tables) | 12 Months Ended
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Dec. 31, 2015
Receivables [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure | During the years ended December 31, 2015, 2014 and 2013, our allowance for doubtful accounts was as follows (amounts in thousands):
|  | 2015 |  | 2014 |  | 2013
Balance, beginning of period |  | $ | 7,110 |  |  | $ | 7,927 |  |  | $ | 6,987 |
Provision for losses |  | 4,055 |  |  | 4,209 |  |  | 5,152 |
Write-offs |  | (4,695 | ) |  | (5,026 | ) |  | (4,212 | )
Balance, end of period |  | $ | 6,470 |  |  | $ | 7,110 |  |  | $ | 7,927 |

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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Valuation Allowance -URI http://asc.fasb.org/extlink&oid=6528051 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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