Consolidated Statements of Changes in Equity / (Deficit) (Unaudited) (Parenthetical) - shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Statement of Stockholders' Equity [Abstract]
Share-based compensation, shares	172,678	110,316
Exercise of stock options, shares	11,743	11,605
Share repurchases, shares	16,694	29,200