Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Schedule of weighted average shares outstanding [Abstract]
Basic shares outstanding (in shares)	101,249,000	100,573,000	101,160,000	100,475,000
Effect of potential common stock [Abstract]
Common stock awards (in shares)	1,143,000	909,000	1,142,000	884,000
Senior subordinated convertible notes (in shares)	74,000	87,000	74,000	109,000
Diluted shares outstanding (in shares)	102,466,000	101,569,000	102,376,000	101,468,000
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock options (in shares)	1,027,350	457,305	1,057,350	651,805