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Indebtedness (Narrative) (Details) - USD ($) $ in Thousands	Oct. 23, 2017	Jun. 28, 2016	Mar. 31, 2018
Revolving Credit Facility
Line of Credit Facility
Line of Credit Facility, Current Borrowing Capacity		$ 1,100,000
Expansion option to increase credit facility		$ 200,000
Senior Notes
Line of Credit Facility
Debt Instrument, Face Amount			$ 300,000
Debt Instrument, Interest Rate, Stated Percentage			5.25%
Securitization Program
Line of Credit Facility
Maximum credit facility amount that can borrow	$ 130,000
Percentage of borrowing capacity on the Securitization Program	80.00%
Percentage of borrowing base on the Securitization Program	100.00%
Minimum borrowing requirement for the Securitization Program			$ 104,000

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Expansion option to increase credit facility

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Minimum borrowing requirement for the Securitization Program

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Percentage of borrowing base on the Securitization Program used in the computation of the minimum borrowing requirement.

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Percentage of borrowing capacity on the Securitization Program used in the computation of the minimum borrowing requirement.

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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-SubTopic 10
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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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