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Equity (Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2017	Aug. 04, 2016	Feb. 15, 2016
Stock Repurchase Program
Repurchase of common stock, authorized amount			$ 50,000,000.0	$ 50,000,000.0
Treasury stock, shares, acquired	9.5
Treasury stock value acquired including acquisition costs	$ 91,800,000
Treasury stock acquired, average cost per share (in dollars per share)	$ 9.71
Available repurchase of common stock, authorized amount (up to)		$ 50,000,000

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Common Stock Acquired, Average Cost Per Share

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Common Stock Value Acquired Including Acquisition Costs

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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