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Stockholders' Equity (Notes)
 6 Months Ended
Jun. 30, 2018
Stockholders' Equity Attributable to Parent [Abstract]  
Stockholders' Equity Note Disclosure [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. During the six months ended June 30, 2018, we did not purchase any shares of our common stock under the stock purchase plan. As of June 30, 2018, the remaining authorized amount under this purchase plan is approximately $7.2 million. We are currently limited on share purchases in accordance with the terms and conditions of our Credit Facility (see Note 16: Long-Term Obligations). 

For the six months ended June 30, 2018, we withheld 23,611 shares of our common stock from employee vested restricted stock units in consideration for $5.5 million in payments made on the employee's behalf for their minimum statutory income tax withholding obligations. Treasury stock is used to issue shares for stock option exercises, restricted stock grants and employee stock purchase plan stock purchases.

Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive income ("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, 2017
 
$
(14,578
)
 
$
(365
)
 
$
(16
)
 
$
(14,959
)
Other comprehensive income before reclassifications
 
(2,290
)
 
391

 
5

 
(1,894
)
Amounts reclassified from AOCI
 
—

 
(377
)
 
—

 
(377
)
Other comprehensive income
 
(2,290
)
 
14

 
5

 
(2,271
)
Balance as of June 30, 2018
 
$
(16,868
)
 
$
(351
)
 
$
(11
)
 
$
(17,230
)