Subsequent Events (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Feb. 28, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Change in classification of deferred compensation awards		$ (39,977)
Subsequent Event [Member]
Subsequent Event [Line Items]
Change in classification of deferred compensation awards	$ 46,400

The difference between the carrying amount of a financial instrument subject to a registration payment arrangement recorded as temporary equity prior to adoption of FSP EITF 00-19-2 and the carrying amount reclassified to permanent equity upon the adoption of FSP EITF 00-19-2. Recorded as a cumulative effect adjustment to the beginning balance of retained earnings. Does not apply to registration payment arrangements that are no longer outstanding upon adoption of FSP EITF 00-19-2.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 40
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6445032&loc=d3e90193-114008

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration