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Stockholders' Deficit Stockholders' Deficit (Equity) (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Schedule of Common Stock Repurchase
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

 
 
Schedule of 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
)