Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

he below financial statement line items, reflected on the December 31, 2014 Consolidated Balance Sheets, were affected by the change in accounting principle.

	Balance Sheet As of December 31, 2014
(In thousands)	As Previously Reported		Adjustment			As Adjusted
Other assets	$	43,870	$	(6,171	)	$	37,699
Total assets	$	1,211,410	$	(6,171	)	$	1,205,239
Convertible senior subordinated notes due 2017 - net	$	57,500	$	(1,557	)	$	55,943
Convertible senior subordinated notes due 2018 - net	$	86,250	$	(2,244	)	$	84,006
Senior notes - net	$	228,469	$	(2,370	)	$	226,099
Total liabilities	$	667,115	$	(6,171	)	$	660,944

Property, Plant and Equipment [Table Text Block]

Following are the major classes of depreciable assets and their estimated useful lives:

	Year Ended December 31,
	2015			2014
Land, building and improvements	$	11,823		$	11,823
Office furnishings, leasehold improvements, computer equipment and computer software	25,676			24,281
Transportation and construction equipment	102			156
Property and equipment	37,601			36,260
Accumulated depreciation	(24,704		)	(24,771		)
Property and equipment, net	$	12,897		$	11,490

	Estimated Useful Lives
Building and improvements	35 years
Office furnishings, leasehold improvements, computer equipment and computer software	3-7 years
Transportation and construction equipment	5-7 years

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]

The summary of capitalized interest for the years ended December 31, 2015, 2014 and 2013 is as follows:

	Year Ended December 31,
(In thousands)	2015			2014			2013
Capitalized interest, beginning of period	$	15,296		$	13,802		$	15,376
Interest capitalized to inventory	18,410			17,937			13,601
Capitalized interest charged to cost of sales	(16,966		)	(16,443		)	(15,175		)
Capitalized interest, end of year	$	16,740		$	15,296		$	13,802
Interest incurred	$	35,931		$	31,302		$	29,539