EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Jan. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Calculation of basic earnings per share:
Net income		$ 60,407		$ 187,108
Calculation of diluted earnings per share:
Net income		$ 60,407		$ 187,108
Predecessor
Calculation of basic earnings per share:
Net income	$ 1,509		$ 118,909		$ 310,525
Average shares issued and outstanding	79,343,253		79,095,917		78,860,218
Issuable under various deferred compensation plans (in shares)	1,109,595		1,135,674		1,081,800
Weighted shares outstanding - basic	80,452,848		80,231,591		79,942,018
Per share:
Net income available to PLC's common shareowners - basic (in dollars per share)	$ 0.02		$ 1.48		$ 3.88
Calculation of diluted earnings per share:
Net income	$ 1,509		$ 118,909		$ 310,525
Weighted shares outstanding - basic	80,452,848		80,231,591		79,942,018
Stock appreciation rights ("SARs") (in shares)	64,570		72,223		342,203
Issuable under various other stock-based compensation plans (in shares)	935,382		869,320		718,215
Restricted stock units (in shares)	306,487		285,736		258,813
Weighted shares outstanding - diluted	81,759,287		81,458,870		81,261,249
Per share:
Net income available to PLC's common shareowners - diluted (in dollars per share)	$ 0.02		$ 1.46		$ 3.82