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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2015 and 2014, respectively, as follows: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Stock-based compensation expense
$
3,867

 
$
3,786

 
$
11,476

 
$
9,481

Less: Deferred tax benefit
(1,425
)
 
(1,322
)
 
(4,084
)
 
(3,272
)
Stock-based compensation expense, net of tax
$
2,442

 
$
2,464

 
$
7,392

 
$
6,209