Earnings Per Common Share (Details Textual) - $ / shares shares in Millions	1 Months Ended	6 Months Ended
Mar. 31, 2015	Jun. 30, 2015
Earnings Per Common Share [Line Items]
Shares repurchased		0.3
Common stock Warrants
Earnings Per Common Share [Line Items]
Exercise price of warrants		$ 26.68
ASR Agreement
Earnings Per Common Share [Line Items]
Shares repurchased	1.3

Number of shares that have been repurchased during the period and are being held in treasury.

Reference 1: 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=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration