Shareholders' Equity, Stock Plans and Preferred Stock (Schedule of Preferred Stock) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning of the period	$ 0	$ 0	$ 4,918
Redemption of preferred stock	0	0	(4,918)
Balance at the end of the period	$ 0	$ 0	$ 0

The aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1377-109256

Name:	us-gaap_PreferredStockDividendsAndOtherAdjustments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration