Summary of Significant Accounting Policies (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2013

Dec. 31, 2012

Property and equipment consisted of the following asset classes:



	June 30, 2013			December 31, 2012
	(thousands)
Land	$	34,992		$	35,662
Buildings	88,818			88,129
Improvements	34,731			34,526
Office equipment and vehicles	85,954			80,857
Machinery and equipment	271,166			264,084
Construction in progress	9,928			11,176
	525,589			514,434
Less accumulated depreciation	(264,280		)	(248,510		)
	$	261,309		$	265,924

Property and equipment consisted of the following asset classes with the following general range of estimated useful lives:



	December 31, 2012			December 31, 2011			General Range of Estimated Useful Lives in Years
	(thousands)
Land	$	35,662		$	35,469
Buildings	88,129			84,510			20	-	40
Improvements	34,526			32,645			10	-	15
Office equipment and vehicles	80,857			74,349			3	-	7
Machinery and equipment	264,084			253,933			7	-	12
Construction in progress	11,176			5,812
	514,434			486,718
Less accumulated depreciation	(248,510		)	(220,262		)
	$	265,924		$	266,456

Southeast Operations

		Years

Buildings		25
Land improvements		Shorter of 20 years or the remaining lease term
Machinery and equipment		7
Office furniture and fixtures		7
Computer equipment		3