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Schedule II Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
 
Balance at
Beginning
of Period
 
Provision
for (Recovery of) Bad
Debt
 
Deductions/
Write-Offs and
Other Charges, Net
 
Balance at
End of Period
Year Ended December 31, 2014
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
931

 
$
1,195

 
$
2,150

 
$
4,276

Year Ended December 31, 2013
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
1,378

 
$
1,440

 
$
(1,887
)
*
$
931

Year Ended December 31, 2012
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
3,092

 
$
(1,265
)
 
$
(449
)
*
$
1,378

 
*
Amounts represent primarily the write-off of certain uncollectible trade receivables that had previously been fully reserved.