Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015
New Accounting Pronouncement, Early Adoption [Line Items]
Reclassification of share-based payment transactions cash outflows from operating activities to cash outflows from financing activities	$ 2,283	$ 1,654
New Accounting Pronouncement, Early Adoption, Effect [Member] \| ASU 2016-09 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Reclassification of share-based payment transactions cash outflows from operating activities to cash outflows from financing activities		$ 1,700

Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration