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Stockholders' Deficit
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Stockholders' Deficit
Stockholders’ Deficit

Treasury Stock
 
Treasury stock is accounted for under the cost method. Treasury stock includes shares repurchased under stock repurchase programs and shares withheld in lieu of minimum tax withholdings due upon vesting of RSUs.

On February 9, 2017, the Company’s Board of Directors (“Board”) authorized the repurchase of approximately $640.9 million of its common stock, in addition to the $359.1 million of its common stock remaining available for repurchase under the previous share repurchase program, for a total repurchase authorization of up to $1.0 billion of its common stock. The share repurchase program has no expiration date. Purchases made under the program could be effected through open market transactions, block purchases, accelerated share repurchase agreements or other negotiated transactions. As of December 31, 2017 there was approximately $477.4 million remaining available for repurchases under the share repurchase program.

Effective February 8, 2018, the Company’s Board authorized the repurchase of approximately $585.8 million of its common stock, in addition to the $414.2 million of its common stock remaining available for repurchase under the previous share repurchase program, for a total repurchase authorization of up to $1.0 billion of its common stock.

The summary of the Company’s common stock repurchases for 2017, 2016 and 2015 are as follows:
 
2017
 
2016
 
2015
Shares
 
Average Price
 
Shares
 
Average Price
 
Shares
 
Average Price
 
(In thousands, except average price amounts)
Total repurchases under the repurchase plans
6,265

 
$
94.59

 
7,789

 
$
81.73

 
9,338

 
$
66.59

Total repurchases for tax withholdings
335

 
$
85.27

 
320

 
$
80.74

 
333

 
$
64.03

Total repurchases
6,600

 
$
94.12

 
8,109

 
$
81.70

 
9,671

 
$
66.50

Total costs
$
621,173

 
 
 
$
662,491

 
 
 
$
643,169

 
 

 
Since inception, the Company has repurchased 227.6 million shares of its common stock for an aggregate cost of $8.8 billion, which is recorded as a reduction of Additional paid-in capital.
Accumulated Other Comprehensive Loss

The following table summarizes the changes in the components of Accumulated other comprehensive loss for 2017 and 2016:
 
Foreign Currency Translation Adjustments Loss
 
Unrealized (Loss) Gain On Investments
 
Total Accumulated Other Comprehensive Loss
 
(In thousands)
Balance, December 31, 2015
$
(3,451
)
 
$
(542
)
 
$
(3,993
)
Changes
85

 
455

 
540

Balance, December 31, 2016
(3,366
)
 
(87
)
 
(3,453
)
Changes
530

 
(18
)
 
512

Balance, December 31, 2017
$
(2,836
)
 
$
(105
)
 
$
(2,941
)