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Shareholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2016
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 and six months ended June 30, 2016 and 2015, respectively, as follows: 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Stock-based compensation expense
$
4,189

 
$
3,859

 
$
7,978

 
$
7,609

Less: Deferred tax benefit
(1,469
)
 
(1,352
)
 
(2,768
)
 
(2,659
)
Stock-based compensation expense, net of tax
$
2,720

 
$
2,507

 
$
5,210

 
$
4,950