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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2015
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, 2015 and 2014, respectively, as follows: 
 
Three Months Ended March 31,
 
2015
 
2014
Stock-based compensation expense
$
3,750

 
$
2,823

Less: Deferred tax benefit
(1,308
)
 
(1,011
)
Stock-based compensation expense, net of tax
$
2,442

 
$
1,812