XML 48 R40.htm IDEA: XBRL DOCUMENT v2.4.0.8
Significant Accounting Policies (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of allowance for doubtful accounts      
Beginning allowance for doubtful accounts $ 6,596 $ 7,279 $ 7,935
Additions charged to expense 22,225 23,728 24,877
Write-offs, net of recoveries (18,518) (24,411) (25,533)
Ending allowance for doubtful accounts $ 10,303 $ 6,596 $ 7,279