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Business Combinations (Tables)
 12 Months Ended
Dec. 31, 2012
Business Combinations [Abstract]  
Purchase price allocation
The purchase price allocation as of February 10, 2011 and as of January 1, 2012 and adjustments made to the estimated acquisition date fair values during the measurement period are as follows (in thousands):
 
 
Acquisition  Date
Estimated Fair Value as
of February 10, 2011
 
Measurement  Period
Adjustments
 
Final Acquisition
Date Fair Value
as of January 1, 2012
Accounts receivable
$
18,321

 
$
1,298

 
$
19,619

Prepaid expenses and other current assets
3,896

 
—

 
3,896

Deferred income tax assets
15,857

 
(7,923
)
 
7,934

Property and equipment
22,359

 
901

 
23,260

Intangible assets
126,900

 
4,900

 
131,800

Other non-current assets
8,884

 
—

 
8,884

Total assets acquired
$
196,217

 
$
(824
)
 
$
195,393

Accounts payable
(3,977
)
 
—

 
(3,977
)
Accrued expenses
(8,461
)
 
—

 
(8,461
)
Deferred income tax liabilities
(43,824
)
 
7,037

 
(36,787
)
Other non-current liabilities
(11,431
)
 
5,411

 
(6,020
)
Long-term debt
(2,014
)
 
—

 
(2,014
)
Total liabilities assumed
(69,707
)
 
12,448

 
(57,259
)
Total identifiable net assets
126,510

 
11,624

 
138,134

Goodwill
283,097

 
(11,624
)
 
271,473

Total cash consideration
$
409,607

 
$
—

 
$
409,607