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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585

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-Name Accounting Standards Codification
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-Section 45
-Paragraph 28
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-Name Accounting Standards Codification
-Topic 230
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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to cash provided by financing activities	$ (83,468)	$ (241,590)
Increase to cash provided by operating activities	$ 143,705	91,679
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to cash provided by financing activities		(1,200)
Increase to cash provided by operating activities		$ 1,200
Retained Earnings [Member] \| Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction to retained earnings			$ 1,800