SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) (USD $) Share data in Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2014 segment item T	Dec. 31, 2013 T	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2015
Accounting Policies [Line Items]
Restructuring charges		$ 1,308,000	$ 1,509,000	$ 9,557,000
Legal, professional and other costs incurred in response to unsolicited tender offer		0	0	43,380,000
Bad debt expense		2,031,000	602,000	2,505,000
Write-offs of accounts receivables		2,561,000	1,946,000	2,805,000
Capitalized software costs		8,753,000	10,321,000
Capitalized software costs during the year		921,000	1,695,000	408,000
Depreciated capitalized software costs		2,501,000	2,230,000	2,463,000
Number of Rabbi Trust estabished		2
Total gain of the Rabbi Trust investment		1,169,000	4,398,000	8,564,000
Unrealized gains		(1,049,000)	4,234,000	9,012,000
Goodwill		3,094,824,000	3,081,521,000	3,086,716,000	3,086,716,000
Percentage of goodwill in total assets		38.00%	37.00%
Number of Reporting Units		19
Number of operating segments		4
Number of reporting units with goodwill		9
Loss on impairment of long-lived assets	3,095,000	3,095,000		2,034,000
Assets subject to fair value measurement on a nonrecurring basis	2,172,000
Percentage of net property, plant & equipment in total assets		38.00%
Percentage of other intangible assets, net in total assets		9.00%
Proceeds frrom sale of future production			153,282,000	73,644,000
Stripping costs		44,896,000	41,716,000	37,875,000
Pre-production stripping costs capitalized		44,035,000	24,026,000
Carrying value of reclamation obligations		226,565,000	228,234,000	150,072,000
Excess tax benefits from share-based compensation		3,464,000	161,000	267,000
Number of volumetric production payment transactions		2
Number of facilities		8
Tons subject to volumetric production payment		250,800,000	143,200,000
Owned Quarries		7
Volumetric production payment estimated tons to be delivered		29,000,000	15,000,000
Volumetric Production Payment Estimated Percentage Sold		11.50%	10.50%
Leased quarries		1
Spread between the amount accrued and the maximum environmental loss		3,000,000
Maximum self-insurance coverage per occurrence for losses related to workers' compensation		2,000,000
Maximum self-insurance coverage per occurrence for automotive and general/product liability		3,000,000
Accounting Standards Codification Topic Seven Hundred And Forty Income Taxes Recognition Threshold For Uncertain Tax Positions		50.00%
Antidilutive common stock equivalents				617
Scenario, Forecast [Member]
Accounting Policies [Line Items]
Restructuring charges, expected costs remaining						5,000,000
Minimum | Scenario, Forecast [Member]
Accounting Policies [Line Items]
Estimated deferred revenue to be recognized in the next 12 months		$ 6,000,000
Machinery and Equipment [Member] | Minimum
Accounting Policies [Line Items]
Estimated service life		3 years
Machinery and Equipment [Member] | Maximum
Accounting Policies [Line Items]
Estimated service life		30 years
Building [Member] | Minimum
Accounting Policies [Line Items]
Estimated service life		10 years
Building [Member] | Maximum
Accounting Policies [Line Items]
Estimated service life		20 years
Land Improvements [Member] | Minimum
Accounting Policies [Line Items]
Estimated service life		7 years
Land Improvements [Member] | Maximum
Accounting Policies [Line Items]
Estimated service life		20 years