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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2013
Stockholders' Equity Note [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three months ended March 31, 2013 and 2012, respectively, as follows: 
 
Three Months Ended
 
March 31,
 
2013
 
2012
Stock-based compensation expense
$
5,293

 
$
4,033

Less: Deferred tax benefit
(1,916
)
 
(1,521
)
Stock-based compensation expense, net of tax
$
3,377

 
$
2,512

 
 
 
 
Schedule Of Reconciliation Of Noncontrolling Interest On The Consolidated Balance Sheet
The following table provides a reconciliation of Noncontrolling interest on the Consolidated Balance Sheet for the period from January 1, 2013 to March 31, 2013: 
 
Noncontrolling
interest
Balance, January 1, 2013
$
19,149

Net income attributable to noncontrolling interest
350

Foreign currency translation adjustments
(451
)
Sale of subsidiary (See Note 13)
(19,048
)
Balance, March 31, 2013
$
—

The following table provides a reconciliation of Noncontrolling interest on the Consolidated Balance Sheet for the period from January 1, 2012 to March 31, 2012: 
 
Noncontrolling
interest
Balance, January 1, 2012
$
16,143

Net income attributable to noncontrolling interest
270

Foreign currency translation adjustments
483

Balance, March 31, 2012
$
16,896