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Stockholders' Equity
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Attributable to Parent [Abstract]  
Treasury Stock [Text Block]
Stockholders' Equity

Treasury Stock

In July 2010, our Board of Directors approved a common stock purchase plan to purchase up to $40.0 million of our common stock. This plan has no expiration date and we have $7.2 million remaining on this purchase plan. During 2016, we purchased $15.4 million of our common stock. We did not purchase any of our common stock under our purchase plan in 2017 or 2015. We used the treasury stock to issue shares for stock option exercises, restricted stock grants and employee stock purchase plan stock purchases. We are currently limited on share purchases in accordance with the terms and conditions of our Credit Facility, (see Note 12: Long-Term Obligations). 

In 2017, we withheld 27,636 shares of our common stock from employee vested restricted stock units in consideration for $4.1 million in payments for the employee's share award income tax withholding obligations. We have no shares remaining in treasury at December 31, 2017.

In 2016, we withheld 20,261 shares of our common stock from employee vested restricted stock units in consideration for $1.9 million in payments for the employee's share award income tax withholding obligations. We had 93 shares remaining in treasury at December 31, 2016.

Accumulated Other Comprehensive Income (Loss)

The components of AOCI, net of tax, were as follows (in thousands):

 
 
Foreign Currency Translation Adjustments
 
Unrealized Gains on Cash Flow Hedges
 
Other Adjustments
 
Total
Balance as of December 31, 2016
 
$
(21,272
)
 
$
—

 
$
—

 
$
(21,272
)
Other comprehensive income (loss) before reclassifications
 
6,694

 
184

 
(16
)
 
6,862

Amounts reclassified from AOCI
 
—

 
(549
)
 
—

 
(549
)
Other comprehensive income (loss)
 
6,694

 
(365
)
 
(16
)
 
6,313

Balance as of December 31, 2017
 
$
(14,578
)
 
$
(365
)
 
$
(16
)
 
$
(14,959
)