Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of weighted average shares outstanding [Abstract]
Basic shares outstanding (in shares)	102,081,000	101,249,000	101,983,000	101,160,000
Effect of potential common stock [Abstract]
Common stock awards (in shares)	1,328,000	1,143,000	1,264,000	1,142,000
Senior subordinated convertible notes (in shares)	0	74,000	0	74,000
Diluted shares outstanding (in shares)	103,409,000	102,466,000	103,247,000	102,376,000
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock options (in shares)	412,100	1,027,350	581,350	1,057,350