Line of credit facility option to increase borrowing capacity.

No definition available.

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Balance Type:	credit
Period Type:	instant

- Definition

Number Of Convertible Senior Note Repurchased

+ References

No definition available.

+ Details

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- Definition

Number of Senior Notes Repurchased

+ References

No definition available.

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- Definition

Sublimit For Loans In Certain Foreign Currencies

+ References

No definition available.

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- Definition

Sublimit For Swingline Loans

+ References

No definition available.

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Period Type:	instant

- Definition

Sublimit For The Issuance Of Letters Of Credit

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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Period Type:	instant

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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- 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.

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- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

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

- Definition

Date the debt instrument was repurchased, in CCYY-MM-DD format.

+ References

No definition available.

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Balance Type:	na
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- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Balance Type:	credit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
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- Definition

The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Balance Type:	credit
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- Definition

Number of shares issued during the period as a result of the conversion of convertible securities.

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Debt and Other Long-Term Liabilities (Narrative) (Details)			12 Months Ended
	Jun. 09, 2014 USD ($)	Mar. 12, 2013 USD ($)	Dec. 31, 2015 USD ($) note	Dec. 31, 2014 USD ($) note shares	Dec. 31, 2013 USD ($) shares	Sep. 02, 2014 USD ($)
Debt Instrument [Line Items]
Principal amount of debt						$ 200,000,000
Proceeds from issuance of senior unsecured notes			$ 0	$ 295,500,000	$ 343,769,000
Gain (loss) from early extinguishment of debt			5,854,000	(2,018,000)	(6,013,000)
Conversion of debt, cash			$ 0	$ 51,149,000	$ 172,211,000
Senior Notes \| Senior Unsecured Notes due 2019
Debt Instrument [Line Items]
Principal amount of debt		$ 350,000,000.0
Interest rate, per year		6.00%
Proceeds from issuance of senior unsecured notes		$ 343,800,000
Senior Notes \| 2021 Notes
Debt Instrument [Line Items]
Principal amount of debt	$ 300,000,000.0
Interest rate, per year	5.875%
Proceeds from issuance of senior unsecured notes	$ 294,000,000
Debt Instrument, Repurchase Date			Dec. 15, 2015
Number of Senior Notes Repurchased \| note			41,092
Debt Instrument, Repurchased Face Amount			$ 41,100,000
Debt Instrument, Repurchase Amount			34,600,000
Gain (loss) from early extinguishment of debt			$ 5,900,000
Credit Facility
Debt Instrument [Line Items]
Interest rate on amounts outstanding under the credit facility			2.29%	1.92%
Convertible Notes
Debt Instrument [Line Items]
Interest rate, per year						4.00%
Gain (loss) from early extinguishment of debt				$ (300,000)
Number of notes retired \| note				51,148
Conversion of debt, cash				$ 51,100,000
Revolving Line of Credit \| Credit Facility
Debt Instrument [Line Items]
Gain (loss) from early extinguishment of debt				$ (1,700,000)
Line of credit facility, maximum borrowing capacity			$ 600,000,000.0
Sublimit for issuance of letters of credit			75,000,000.0
Sublimit for swingline loans			50,000,000.0
Sublimit for loans in certain foreign countries			75,000,000.0
Line of credit facility, option to increase borrowing capacity			200,000,000.0
Term Loans \| Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 150,000,000.0
Common Stock
Debt Instrument [Line Items]
Conversion of callable convertible debt, net of tax (in shares) \| shares				431,760	272,336