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Fair Values of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following table provides a summary of the company’s assets and liabilities that are measured on a recurring basis (in thousands):
 
 
Basis for Fair Value Measurements at Reporting Date
 
Quoted Prices in Active Markets
for Identical
Assets /
(Liabilities)
 
Significant
Other
Observable
Inputs
 
Significant
Other
Unobservable
Inputs
 
Level I
 
Level II
 
Level III
December 31, 2017
 
 
 
 
 
 
Forward Exchange Contracts—net
 
—

 
$
(1,390
)
 
—

Convertible 2021 debt conversion liability
 
—

 
(53,154
)
 
—

Convertible 2021 note hedge asset
 
—

 
46,915

 
—

Convertible 2022 debt conversion liability
 
—

 
(53,414
)
 
—

Convertible 2022 note hedge asset
 
—

 
46,680

 
—

December 31, 2016
 
 
 
 
 
 
Forward Exchange Contracts—net
 
—

 
$
971

 
—

Convertible 2021 debt conversion liability
 
—

 
(30,708
)
 
—

Convertible 2021 note hedge asset
 
—

 
25,471

 
—
Fair Value, by Balance Sheet Grouping
The carrying and fair values of the company’s financial instruments at December 31, 2017 and 2016 are as follows (in thousands):
 
2017
 
2016
 
Carrying
Value
 
Fair Value
 
Carrying
Value
 
Fair Value
Cash and cash equivalents
$
176,528

 
$
176,528

 
$
124,234

 
$
124,234

Other investments
103

 
103

 
108

 
108

Installment receivables, net of reserves
1,809

 
1,809

 
1,834

 
1,834

Long-term debt (including current maturities of long-term debt) *
(243,445
)
 
(294,173
)
 
(161,349
)
 
(164,900
)
Convertible 2021 debt conversion liability in Other Long-Term Obligations
(53,154
)
 
(53,154
)
 
(30,708
)
 
(30,708
)
Convertible 2021 note hedge in Other Long-Term Assets
46,915

 
46,915

 
25,471

 
25,471

Convertible 2022 debt conversion liability in Other Long-Term Obligations
(53,414
)
 
(53,414
)
 
—

 
—

Convertible 2022 note hedge in Other Long-Term Assets
46,680

 
46,680

 
—

 
—

Forward contracts in other current assets
730

 
730

 
2,754

 
2,754

Forward contracts in accrued expenses
(2,120
)
 
(2,120
)
 
(1,783
)
 
(1,783
)

________
* The company's long-term debt is shown net of discount and fees associated with the Convertible Senior Notes due 2021 and 2022 on the company's consolidated balance sheet. Accordingly, the fair values of the Convertible Senior Notes due 2021 and 2022 are included in the long-term debt presented in this table is also shown net of the discount and fees.