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Components of Change in Deferred Revenue-Entry of Right-to-Use Contracts and Deferred Commission Expense Level 3 (Tables)
 12 Months Ended
Dec. 31, 2013
Deferred Revenue-entry of right-to-use contracts and Deferred Commission Expense [Abstract]  
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]
Components of the change in deferred revenue-entry of right-to-use contracts and deferred commission expense are as follows (amounts in thousands):
 
 
2013
 
2012
Deferred revenue—entry of right-to-use contracts, as of January 1,
 
$
62,979

 
$
56,285

Deferral of new right-to-use contracts
 
13,142

 
13,433

Deferred revenue recognized
 
(7,448
)
 
(6,739
)
Net increase in deferred revenue
 
5,694

 
6,694

Deferred revenue—entry of right-to-use contracts, as of December 31,
 
$
68,673

 
$
62,979

 
 
 
 
 
Deferred commission expense, as of January 1,
 
$
22,841

 
$
19,686

Costs deferred
 
5,011

 
5,465

Commission expense recognized
 
(2,601
)
 
(2,310
)
Net increase in deferred commission expense
 
2,410

 
3,155

Deferred commission expense, as of December 31,
 
$
25,251

 
$
22,841