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Principal Accounting Policies Allowance for Revenue Adjustments (Tables)
 12 Months Ended
Dec. 31, 2013
Allowance for Revenue Adjustments [Line Items]  
Allowance for Revenue Adjustments [Table Text Block]
(Dollars in thousands)
 
Additions
 
 
 
 
 
 
Balance at
beginning 
of period
 
Charged to 
expense
 
Charged to other
accounts - Revenue
 
Write-offs
 
Balance at end of
period
2013
 
$
13,816

 
$
—

 
$
74,481

 
$
(76,082
)
 
$
12,215

2012
 
16,920

 
—

 
77,310

 
(80,414
)
 
13,816

2011
 
14,291

 
—

 
86,853

 
(84,224
)
 
16,920