THREE-FOR-TWO STOCK SPLIT (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Income	$ 31,749	$ 45,046	$ 45,073	$ 30,281	$ 29,917	$ 41,121	$ 40,860	$ 25,766	$ 152,149	$ 137,664	$ 123,330
Income per share Basic (in dollars per share)	$ 0.15	$ 0.21	$ 0.21	$ 0.14	$ 0.14	$ 0.19	$ 0.19	$ 0.12	$ 0.70	$ 0.63	$ 0.56
Income per share Diluted (in dollars per share)	$ 0.15	$ 0.21	$ 0.21	$ 0.14	$ 0.14	$ 0.19	$ 0.19	$ 0.12	$ 0.70	$ 0.63	$ 0.56
Weighted average shares outstanding - basic (in shares)									218,583,000	218,695,000	219,121,000
Weighted average shares outstanding - diluted (in shares)									218,583,000	218,695,000	219,121,000
Pro forma [Member] (Unaudited)
Net Income										$ 137,664
Income per share Basic (in dollars per share)										$ .94
Income per share Diluted (in dollars per share)										$ .94
Weighted average shares outstanding - basic (in shares)										145,796,000
Weighted average shares outstanding - diluted (in shares)										145,796,000
Adjustment [Member]
Net Income
Income per share Basic (in dollars per share)										$ (.31)
Income per share Diluted (in dollars per share)										$ (0.31)
Weighted average shares outstanding - basic (in shares)										72,899,000
Weighted average shares outstanding - diluted (in shares)										72,899,000