Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - shares	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Stock issued for benefit plans (shares)	352,476	154,665
Purchase of treasury stock (shares)	51,642	102,673
Employee stock purchase plan (shares)	87,629	71,825
Issuance of restricted stock (shares)	237,484	392,292