Long-Term Debt - Interest Rates (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
1.875% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 2,355	$ 2,841
Debt instrument, interest rate	1.875%	1.875%
4.15% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 2,641	$ 2,884
Debt instrument, interest rate	4.15%	4.15%
4.50% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 439	$ 589
Debt instrument, interest rate	4.50%	4.50%
5.45% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 3,927	$ 4,004
Debt instrument, interest rate	5.45%	5.45%

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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