Cash received upon termination of 2015 swaps

No definition available.

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Period Type:	duration

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate fair value hedge that is amortized upon discontinuation of the interest rate fair value hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 35
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=56949341&loc=d3e75592-113984

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
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- Details

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- Details

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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember
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- Details

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- Details

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- Details

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Financial Instruments Measured at Fair Value - Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Debt Instrument, Description of Variable Rate Basis	6 mo. USD LIBOR +
Notional amount	$ 460,233	$ 382,025
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ 927	$ 4,232	$ (1,851)
6.00% notes, due 2020 [Member]
Derivatives, Fair Value [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.00%
6.875% senior debentures, due 2018 [Member]
Derivatives, Fair Value [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.875%
3.375% notes, due 2015 [Member]
Derivatives, Fair Value [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.375%	3.375%
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ (608)	$ (523)	(656)
Interest rate swaps designated as fair value hedges [Member] \| 6.00% notes, due 2020 [Member]
Derivatives, Fair Value [Line Items]
Notional amount	50,000
Interest rate swaps designated as fair value hedges [Member] \| 6.875% senior debentures, due 2018 [Member]
Derivatives, Fair Value [Line Items]
Notional amount	50,000
Interest Rate Swaps Converting Notes Due in 2015 [Member]
Derivatives, Fair Value [Line Items]
Notional amount		$ 200,000		$ 250,000
Debt Instrument, Interest Rate, Stated Percentage		1.98%
Cash received upon termination of 2015 swaps		$ 896
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge				$ 11,856
Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	1,535	4,755	(1,195)
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net	0	827	0
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net	$ (153)	$ (1,001)	$ 412
due to counterparty [Member] \| 6.00% notes, due 2020 [Member]
Derivatives, Fair Value [Line Items]
Derivative, Variable Interest Rate	3.896%
due to counterparty [Member] \| 6.875% senior debentures, due 2018 [Member]
Derivatives, Fair Value [Line Items]
Derivative, Variable Interest Rate	5.301%
Due From Counterparty [Member] \| 6.00% notes, due 2020 [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fixed Interest Rate	6.00%
Due From Counterparty [Member] \| 6.875% senior debentures, due 2018 [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fixed Interest Rate	6.875%