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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
During the years ended December 31, 2014, 2013 and 2012, our allowance for doubtful accounts was as follows (amounts in thousands):
 
 
2014
 
2013
 
2012
Balance, beginning of period
 
$
7,927

 
$
6,987

 
$
7,700

Provision for losses
 
4,209

 
5,152

 
4,860

Write-offs
 
(5,026
)
 
(4,212
)
 
(5,573
)
Balance, end of period
 
$
7,110

 
$
7,927

 
$
6,987
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
2015
$
349

2016
$
251

2017
$
87

2018
$
87

2019
$
87