Stock Plans (LTIP Target Performance Shares) (Details) (Performance Shares [Member])	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at beginning of period (in shares)	1,749,000
Shares granted (in shares)	1,028,000	1,124,000	979,000
Shares forfeited (in shares)	(80,000)
Balance at end of period (in shares)	2,697,000	1,749,000