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- Definition

Optional Addition To Borrowing Capacity

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- Definition

Debt Instrument, Extension, Term

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Debt Instrument, Redemption Price, Percent of Principal Balance

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Total advances received under the economic development agreements with governmental entities

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Economic Development Agreements - Advances not yet Received

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Measurement frequency for performance conditions under the economic development agreements.

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- Definition

Economic Development Agreements - Term (in years)

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Total advances agreed to be advanced by governmental entities based on economic development agreements

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Fixed Charge Coverage Ratio

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Total Leverage Ratio

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No definition available.

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- Definition

Cash outflow in the form of special dividends to common shareholders.

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No definition available.

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- Definition

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

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No definition available.

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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.

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No definition available.

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- Definition

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

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

Description of the frequency of periodic payments (monthly, quarterly, annual).

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- Definition

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

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- Definition

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

+ References

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- Definition

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

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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.

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No definition available.

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- Definition

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

+ References

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- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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No definition available.

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- Definition

Amount, after accumulated amortization, of debt discount.

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- Definition

Amount, after accumulated amortization, of debt premium.

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

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- 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.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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No definition available.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Debt - Narrative (Details)					12 Months Ended
Debt - Narrative (Details)	Jul. 21, 2015 USD ($)	Aug. 23, 2012 USD ($)	Jun. 27, 2012 USD ($)	Aug. 25, 2010 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 30, 2014 USD ($)	Apr. 30, 2013 USD ($)
2012 Special Cash Dividend \| 2012 Special Cash Dividend
Debt Instrument [Line Items]
Payments of special dividends		$ 600,700,000
Collateralized Mortgage
Debt Instrument [Line Items]
Debt instrument stated interest rate							7.26%
Debt instrument effective interest rate					4.57%	4.57%
Mortgage obligation							$ 9,500,000
Debt instrument, future balloon payment							6,900,000
Debt instrument, unamortized premium					$ 700,000	$ 900,000	$ 1,200,000
Economic Development Loans
Debt Instrument [Line Items]
Debt instrument stated interest rate					3.00%
Debt instrument effective interest rate					3.00%	3.00%
Economic development agreements - total advances agreed upon								$ 4,400,000
Economic development agreements - advances received					$ 3,700,000
Economic development agreements - advances not yet received					$ 700,000
Economic development agreements - measurement frequency					annually
Economic development agreements - term					10 years
$400 Million Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Debt instrument issuance date			Jun. 27, 2012
Debt instrument, face amount			$ 400,000,000
Debt instrument stated interest rate			5.75%
Debt instrument effective interest rate			6.00%		6.00%	6.00%
Debt instrument maturity date			Jul. 01, 2022
Debt instrument payment frequency			semi-annually
$400 Million Senior Notes \| Senior Notes \| Debt Instrument Redemption
Debt Instrument [Line Items]
Debt instrument, percentage of principal amount to be redeemed			100.00%
$400 Million Senior Notes \| Senior Notes \| Debt Instrument Redemption \| Treasury Rate
Debt Instrument [Line Items]
Debt instrument, description of variable rate basis			Treasury Rate
Debt instrument, basis spread on variable rate			0.50%
$400 Million Senior Notes \| Senior Notes \| 2012 Special Cash Dividend \| 2012 Special Cash Dividend
Debt Instrument [Line Items]
Special dividend payment date		Aug. 23, 2012
$250 Million Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Debt instrument issuance date				Aug. 25, 2010
Debt instrument, face amount				$ 250,000,000
Debt instrument stated interest rate				5.70%
Debt instrument effective interest rate				6.19%	6.19%	6.19%
Debt instrument maturity date				Aug. 28, 2020
Debt instrument payment frequency				semi-annually
Senior notes, discount				$ 600,000
$250 Million Senior Notes \| Senior Notes \| Debt Instrument Redemption
Debt Instrument [Line Items]
Debt instrument, percentage of principal amount to be redeemed				100.00%
$250 Million Senior Notes \| Senior Notes \| Debt Instrument Redemption \| Treasury Rate
Debt Instrument [Line Items]
Debt instrument, description of variable rate basis				Treasury Rate
Debt instrument, basis spread on variable rate				0.45%
$450 Million Unsecured Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, face amount	$ 450,000,000
Debt instrument effective interest rate					2.23%	2.17%
Debt instrument maturity date	Jul. 21, 2020
Debt instrument, extension, term	1 year
Debt instrument additional borrowing capacity	$ 150,000,000
Credit facility, unused capacity, commitment fee percentage	0.20%
$450 Million Unsecured Revolving Credit Facility \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Credit facility, commitment fee percentage	0.25%
Total leverage ratio (not more than)	4.5
$450 Million Unsecured Revolving Credit Facility \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Credit facility, commitment fee percentage	0.10%
Total leverage ratio (not more than)	4
Fixed charge coverage ratio (not less than)	2.5
$450 Million Unsecured Revolving Credit Facility \| Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Debt instrument, description of variable rate basis	LIBOR
$450 Million Unsecured Revolving Credit Facility \| Revolving Credit Facility \| LIBOR \| Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
$450 Million Unsecured Revolving Credit Facility \| Revolving Credit Facility \| LIBOR \| Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.35%
$450 Million Unsecured Revolving Credit Facility \| Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Debt instrument, description of variable rate basis	base rate
$450 Million Unsecured Revolving Credit Facility \| Revolving Credit Facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.75%
$450 Million Unsecured Revolving Credit Facility \| Revolving Credit Facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.35%
$450 Million Unsecured Revolving Credit Facility \| Revolving Credit Facility \| Total Leverage Ratio exceeds 4.00 to 1.00
Debt Instrument [Line Items]
Credit facility, dividend restrictions	$ 50,000,000
$450 Million Unsecured Revolving Credit Facility \| Revolving Credit Facility \| Alternative Currency Loans
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity	35,000,000
$450 Million Unsecured Revolving Credit Facility \| Revolving Credit Facility \| Swingline Loans
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity	$ 15,000,000