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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 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(22))
-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 944
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Paragraph 1
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Debt Instrument, Subjective Acceleration Clause, Percentage of EBITDA, Minimum

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Line Of Credit Facility, Additional Capacity Under Accordion Feature

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Line of Credit Facility, Increase in Borrowing Capacity

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Senior Notes, Secured, and Unsecured Indebtedness - Revolving Line of Credit - Narrative (Details) - USD ($)		3 Months Ended
	Jul. 01, 2016	Mar. 31, 2017	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Mar. 30, 2018	Mar. 09, 2018	Mar. 08, 2018	Dec. 31, 2017	Dec. 30, 2017	Nov. 28, 2017	Mar. 31, 2014
Debt Instrument [Line Items]
Notes payable					$ 172,246,000				$ 94,515,000
6% Senior Notes due 2023
Debt Instrument [Line Items]
Stated interest rate					6.00%
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]
Maximum borrowing capacity											$ 170,000,000.0
Line of Credit Facility, Increase in Borrowing Capacity											$ 25,000,000.0
Effective rate					4.88%
Revolving Credit Facility \| Amended Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 130,000,000.0
Commitment fee percentage		50.00%
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, Covenant, Tangible Net Worth, Minimum					$ 451,000,000.0
Debt instrument, subjective acceleration clause, percentage of EBITDA, minimum	50.00%
Debt Instrument, Covenant, Leverage Ratio, Maximum						65.00%			60.00%	62.50%
Debt Instrument, Covenant, Interest Coverage Ratio, Minimum					1.50
Debt Instrument, Covenant, Interest Coverage Ratio, Maximum Liquidity Used in Calculation					$ 50,000,000.0
Revolving Credit Facility \| Amendment to Second Amended Facility
Debt Instrument [Line Items]
Debt Instrument, Covenant, Leverage Ratio, Maximum					70.00%	60.00%
Letter of Credit
Debt Instrument [Line Items]
Outstanding letter of credit					$ 11,000,000				$ 7,800,000
Letter of Credit \| Amended Facility
Debt Instrument [Line Items]
Outstanding letter of credit					$ 11,000,000				$ 7,800,000
Letter of Credit \| Second Amended Facility
Debt Instrument [Line Items]
Minimum borrowing capacity	$ 50,000,000.0
Senior Notes \| 6% Senior Notes due 2023
Debt Instrument [Line Items]
Stated interest rate		8.50%					6.00%	6.00%
Senior Notes \| 5 3/4% Senior Notes due April 15, 2019
Debt Instrument [Line Items]
Stated interest rate					5.75%				5.75%			5.75%
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Notes payable					$ 85,000,000				$ 0
Subsequent Event \| Revolving Credit Facility \| Amendment to Second Amended Facility
Debt Instrument [Line Items]
Debt Instrument, Covenant, Leverage Ratio, Maximum			60.00%	65.00%