Share-Based Compensation (Details 1) - $ / shares	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
StockIssuedDuringPeriodSharebasedCompensationAbstract
Options granted (in shares)	269,500		584,550	401,750
Options weighted average grant date fair value (in dollars per share)	$ 6.75		$ 5.62	$ 7.46
Options weighted average exercise price (in dollars per share)	$ 14.60		$ 12.24	$ 16.47

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration