Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Asset
-URI http://asc.fasb.org/extlink&oid=6510090

Name:	us-gaap_DeferredTaxAssetsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 01, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Deferred Tax Assets, Gross	$ 124,872		$ 95,397
Adjustments for New Accounting Principle, Early Adoption
Property, Plant and Equipment [Line Items]
Deferred Tax Assets, Gross		$ 18,000
Retained earnings
Property, Plant and Equipment [Line Items]
Cumulative-effect of accounting change adopted as of January 1, 2016		$ (600)	$ (627)