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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2013
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | During the years ended December 31, 2013, 2012 and 2011, our allowance for doubtful accounts was as follows (amounts in thousands):
|  | 2013 |  | 2012 |  | 2011
Balance, beginning of period |  | $ | 6,987 |  |  | $ | 7,700 |  |  | $ | 6,580 |
Provision for losses |  | 5,152 |  |  | 4,860 |  |  | 4,156 |
Write-offs |  | (4,212 | ) |  | (5,573 | ) |  | (3,036 | )
Balance, end of period |  | $ | 7,927 |  |  | $ | 6,987 |  |  | $ | 7,700 |
Estimated Amortization of Identified Intangible Assets for Next Five Years | Estimated amortization of identified intangible assets for each of the next five years are as follows (amounts in thousands):
Year ending December 31, | Amount
2014 | $ | 349 |
2015 | 349 |
2016 | 251 |
2017 | 87 |
2018 | 87 |

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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