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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]  
Schedule Of Interest And Penalties
 
September 30, 2017
 
December 31, 2016
Gross liability for unrecognized tax benefits, exclusive of interest and penalties
$
16,038

 
$
17,287

Interest and penalties on unrecognized benefits
1,361

 
1,224

Total gross uncertain tax positions
$
17,399

 
$
18,511

Amount included in Current liabilities
$
2,648

 
$
3,866

Amount included in Other long-term liabilities
14,751

 
14,645

 
$
17,399

 
$
18,511
Schedule of Effective Income Tax Rate Reconciliation The Company's effective income tax rate for the three and nine months ended September 30, 2017 and 2016 differs from the federal income tax statutory rate due to the following:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2017
 
2016
 
2017
 
2016
Statutory rate
 
35.0
 %
 
35.0
 %
 
35.0
 %
 
35.0
 %
State taxes, net of federal tax benefit
 
1.7

 
1.2

 
1.7

 
1.5

Foreign tax expense and tax rate differential
 
(1.0
)
 
(0.8
)
 
(1.0
)
 
(0.8
)
Tax benefit from stock option exercises
 
(4.5
)
 
—

 
(3.9
)
 
—

Expiration of the statute of limitations
 
(2.6
)
 
(0.8
)
 
(0.9
)
 
(0.3
)
Other, net
 
(0.9
)
 
(0.8
)
 
(0.7
)
 
(0.7
)
 
 
27.7
 %
 
33.8
 %
 
30.2
 %
 
34.7
 %