Significant Accounting Policies - Weighted-Average Shares Used to Calculate Basic and Diluted EPS (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share (EPS) [Abstract]
Basic shares (in shares)	67,550	67,434	66,897
Dilutive shares (in shares)	142	160	176
Diluted shares (in shares)	67,692	67,594	67,073