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

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 13, 16
-Article 9

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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-Paragraph 19, 20, 22
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Line of Credit Facility, Minimum Borrowing Capacity

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Senior Notes, Secured, and Unsecured Indebtedness - Revolving Line of Credit - Narrative (Details) - USD ($)		6 Months Ended
	Jul. 01, 2016	Jun. 30, 2016	Dec. 31, 2015	Mar. 27, 2015	Mar. 31, 2014
Debt Instrument [Line Items]
Notes payable		$ 239,390,000	$ 175,181,000
5 3/4% Senior Notes due April 15, 2019
Debt Instrument [Line Items]
Stated interest rate		5.75%	5.75%
Revolving Credit Facility
Debt Instrument [Line Items]
Effective rate		4.04%	3.32%
Revolving Credit Facility \| Amended Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 130,000,000.0		$ 130,000,000.0
Additional capacity under accordion feature				200,000,000.0
Commitment fee percentage		0.50%
Revolving Credit Facility \| Original Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				100,000,000
Additional capacity under accordion feature				125,000,000.0
Letter of Credit
Debt Instrument [Line Items]
Outstanding letter of credit		$ 8,600,000
Letter of Credit \| Amended Facility
Debt Instrument [Line Items]
Minimum borrowing capacity				$ 50,000,000.0
Outstanding letter of credit		$ 8,600,000
Senior Notes \| 5 3/4% Senior Notes due April 15, 2019
Debt Instrument [Line Items]
Stated interest rate		5.75%			5.75%
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Notes payable		$ 59,000,000	$ 65,000,000
Subsequent Event \| Revolving Credit Facility \| Second Amended Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 145,000,000.0
Additional capacity under accordion feature	$ 200,000,000.0
Debt instrument, subjective acceleration clause, percentage of EBITDA, minimum	50.00%
Subsequent Event \| Letter of Credit \| Second Amended Facility
Debt Instrument [Line Items]
Minimum borrowing capacity	$ 50,000,000.0