Financial Commitments (Narrative) (Details)		6 Months Ended
Apr. 19, 2017 USD ($)	Jun. 30, 2017 USD ($) d / item $ / shares shares
Letters Of Credit [Member]
Debt Instrument [Line Items]
Face amount	$ 150,000,000
Maximum borrowing capacity		$ 150,000,000
Swingline Loans [Member]
Debt Instrument [Line Items]
Face amount		10,000,000
Convertible Notes [Member]
Debt Instrument [Line Items]
Face amount		$ 200,000,000
Interest rate		2.875%
Maturity date		Jun. 15, 2021
Conversion price, shares \| shares		33.0579
Conversion price \| $ / shares		$ 30.25
Effective interest rates		9.39%
Convertible Notes [Member] \| Circumstance One [Member]
Debt Instrument [Line Items]
Business day period after consecutive trading day period		5 days
Consecutive trading day period		10 days
Percentage of conversion price		98.00%
Conversion price, principal amount		$ 1,000
Convertible Notes [Member] \| Circumstance Two [Member]
Debt Instrument [Line Items]
Business day period within consecutive trading day period \| d / item		20
Consecutive trading day period		30 days
Percentage of conversion price		130.00%
Conversion stock price trigger \| $ / shares		$ 39.32
Term Loan [Member]
Debt Instrument [Line Items]
Face amount	250,000,000
2010 Senior Notes [Member]
Debt Instrument [Line Items]
Face amount	$ 300,000,000
Interest rate	7.625%
Maturity date	Nov. 01, 2018
2017 Senior Notes [Member]
Debt Instrument [Line Items]
Effective interest rates		7.13%
2017 Senior Notes [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Face amount		$ 500,000,000
Interest rate		6.875%
Redemption price, change of control triggering event (as a percent)		101.00%
2017 Senior Notes [Member] \| Circumstance One [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Redemption price		100.00%
2017 Senior Notes [Member] \| Circumstance Two [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Percentage of notes that can be redeemed		40.00%
Redemption price		106.875%
2017 Credit Facility [Member]
Debt Instrument [Line Items]
Applicable margin and letter of credit fees will be increased percentage per annum.		2.00%
Weighted-average annual interest rate on borrowings		3.70%
Maximum borrowing capacity		$ 350,000,000
Additional borrowing		150,000,000
Available borrowing capacity		$ 225,000,000
Maturity date		Apr. 20, 2022
Fixed charge coverage ratio		1.25
2017 Credit Facility [Member] \| Minimum [Member[
Debt Instrument [Line Items]
Consolidated leverage ratio		3.25
2017 Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Consolidated leverage ratio		4.00
2017 Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent)		2.50%
2017 Credit Facility [Member] \| LIBOR [Member] \| Minimum [Member[
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent)		1.50%
2017 Credit Facility [Member] \| LIBOR [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent)		3.00%
2017 Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent)		1.50%
2017 Credit Facility [Member] \| Base Rate [Member] \| Circumstance Three [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent)		1.00%
2017 Credit Facility [Member] \| Base Rate [Member] \| Circumstance Four [Member]
Debt Instrument [Line Items]
Interest rate		0.00%
2017 Credit Facility [Member] \| Base Rate [Member] \| Minimum [Member[
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent)		0.50%
2017 Credit Facility [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent)		2.00%
2017 Credit Facility [Member] \| Federal Funds Rate [Member] \| Circumstance Two [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent)		0.50%
2014 Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date	May 01, 2018
Maximum borrowing capacity	$ 300,000,000
2014 Credit Facility [Member] \| LIBOR [Member] \| Minimum [Member[ \| Term Loan [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent)	1.25%
2014 Credit Facility [Member] \| LIBOR [Member] \| Maximum [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Basis points added to reference rate (as a percent)	3.00%

Annual Percentage Increase To Debt Instrument Basis Spread On Variable Rate, In The Event Of Default

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- Definition

Debt Instrument, Convertible, Debt Principal Amount

+ References

No definition available.

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- Definition

Debt Instrument, Convertible, Threshold Business Day Period After Consecutive Trading Day Period

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No definition available.

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- Definition

Upon the occurrence of a change of control triggering event specified in the Indenture, the Company must offer to purchase the Senior Notes at a redemption price expressed as percentage of the principal amount thereof, plus accrued and unpaid interest, if any, to the date of purchase.

+ References

No definition available.

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- Definition

The minimum fixed charge ratio, as defined in the line of credit agreement, which the reporting entity must maintain in order to be in compliance with the terms of the line of credit facility.

+ References

No definition available.

+ Details

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- Definition

Line of Credit Facility, Additional Borrowing Available

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No definition available.

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- Definition

Percentage Of Notes That Can Be Redeemed At Company's Discretion

+ References

No definition available.

+ Details

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- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
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- Definition

Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective.

+ References

No definition available.

+ Details

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- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- 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
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-SubTopic 30
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-Paragraph 2
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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))
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-Section 45
-Paragraph 2
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Balance Type:	na
Period Type:	instant

- Definition

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

+ References

+ 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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Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

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Balance Type:	na
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

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

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