Share-Based Compensation - Schedule of Share Based Compensation Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Options, Shares:
Outstanding Beginning Shares	2,736,000	3,126,000	3,713,000
Granted Shares	0	176,000	186,000
Exercised Shares	(653,000)	(564,000)	(341,000)
Forfeited or Expired Shares	(20,000)	(2,000)	(432,000)
Outstanding Ending Shares	2,063,000	2,736,000	3,126,000
Shares Exercisable	1,776,000
Weighted Average Exercise Price:
Outstanding Beginning Weighted Average Exercise Price	$ 21.26	$ 18.93	$ 17.85
Granted Weighted Average Exercise Price		27.92	23.35
Exercised Weighted Average Exercise Price	15.63	10.37	7.70
Forfeited or Expired Weighted Average Exercise Price	22.91	29.21	20.34
Outstanding Ending Weighted Average Exercise Price	23.03	$ 21.26	$ 18.93
Exercisable Weighted Average Exercise Price	$ 22.82
Weighted Average Remaining Contractual Term:
Outstanding Weighted Average Remaining Contractual Term	3 years 10 months 24 days
Exercisable Weighted Average Remaining Contractual Term	3 years 7 months 6 days
Aggregate Intrinsic Value :
Outstanding Intrinsic Value	$ 4,111
Exercisable Intrinsic Value	$ 3,840