EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		5 Months Ended	6 Months Ended
	Jan. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Calculation of basic earnings per share:
Net income		$ 63,840		$ 126,701
Calculation of diluted earnings per share:
Net income		$ 63,840		$ 126,701
Predecessor
Calculation of basic earnings per share:
Net income	$ 1,509		$ 107,977		$ 191,616
Average shares issued and outstanding	79,343,253		78,852,583		78,740,416
Issuable under various deferred compensation plans (in shares)	1,109,595		1,126,570		1,054,415
Weighted shares outstanding - basic	80,452,848		79,979,153		79,794,831
Per share:
Net income available to PLC's common shareowners - basic (in dollars per share)	$ 0.02		$ 1.35		$ 2.40
Calculation of diluted earnings per share:
Net income	$ 1,509		$ 107,977		$ 191,616
Weighted shares outstanding - basic	80,452,848		79,979,153		79,794,831
Stock appreciation rights ("SARs") (in shares)	64,570		492,463		479,430
Issuable under various other stock-based compensation plans (in shares)	935,382		716,327		641,411
Restricted stock units (in shares)	306,487		258,334		245,128
Weighted shares outstanding - diluted	81,759,287		81,446,277		81,160,800
Per share:
Net income available to PLC's common shareowners - diluted (in dollars per share)	$ 0.02		$ 1.33		$ 2.36