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Summary of Significant Accounting Policies - Debt Issuance and Amendment Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Debt issuance costs related to amendment	$ 1,976	$ 1,507	$ 0
Capitalized debt issuance costs	14,900	12,900
Accumulated amortization of debt issuance costs	8,600	7,400
Amortization expense related to capitalized debt issuance costs	$ 1,270	$ 1,321	$ 1,356

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Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(8))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

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The cumulative amount of amortization of deferred issuance costs associated with an own-share lending arrangement which has been periodically charged to earnings, generally as a component of interest expense, during the term of the arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=7656903&loc=SL6757479-112611

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Amount of issuance costs recognized in a share-lending arrangement entered into by the entity, in contemplation of a convertible debt offering or other financing, before deduction of accumulated amortization or effects of subsequent adjustments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 470
-SubTopic 20
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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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