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Gross amount of debt extinguished.

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Debt (Narrative) (Details) $ in Thousands			12 Months Ended
Debt (Narrative) (Details) $ in Thousands	Sep. 15, 2016 USD ($)	Dec. 01, 2015 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 14, 2016 USD ($)
Debt Instrument [Line Items]
Issued amount			$ 350,000
Loss on debt extinguishment			0	$ 0	$ (12,529)
Payments of debt extinguishment costs			0	0	8,438
Payments of debt issuance costs			0	38	$ 7,011
Long-term debt, gross			350,000	354,798
Letters of credit, amount outstanding			61,000
Long-term debt			345,197	349,159
Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Issuance date	Sep. 15, 2016
Issued amount	$ 350,000
Debt Instrument Maturity Year	2024
Maturity date	Oct. 01, 2024
Interest rate	5.50%
Frequency of periodic payment	payable semiannually on April 1 and October 1
Change in control repurchase percentage	101.00%
Payments of debt issuance costs				6,700
Long-term debt, gross			350,000	350,000
Market value in excess of carrying value			21,000
Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 375,000					$ 450,000
Maximum letters of credit issuance	$ 100,000					$ 75,000
Unused capacity, commitment fee percentage		0.25%
Minimum fixed charge coverage ratio		1.00
Minimum excess availability for 30 consecutive days		$ 33,300
Threshold for line cap percentage		0.10
Minimum line cap percentage for 30 consecutive days		0.10
Long-term debt, gross			0	4,462
Initial agreement date		Dec. 01, 2015
Amendment date	Sep. 15, 2016
Threshold for excess availability		$ 33,300
Remaining borrowing capacity			$ 309,500
Revolving Credit Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Outstanding letters of credit fee		0.0075
Revolving Credit Agreement [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Outstanding letters of credit fee		0.0125
Revolving Credit Agreement [Member] \| Base Rate Option [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Revolving Credit Agreement [Member] \| Base Rate Option [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.25%
Revolving Credit Agreement [Member] \| Base Rate Option [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.75%
Revolving Credit Agreement [Member] \| LIBOR Rate Option [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.25%
Revolving Credit Agreement [Member] \| LIBOR Rate Option [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Revolving Credit Agreement [Member] \| Federal Funds Rate [Member] \| Base Rate Option [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Extinguishment of debt				$ 250,000
Effective interest percentage				9.00%
Interest paid on extinguished debt				$ 11,300
Loss on debt extinguishment				12,529
Payments of debt extinguishment costs				8,400
Write off of deferred debt issuance cost				$ 4,100
Debt Instrument, Redemption, Period One [Member] \| Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Additional redemption percentage	1.00%
Redemption price percentage	104.125%
Debt Instrument, Redemption, Period One [Member] \| Senior Notes Due 2024 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption price percentage allowed	100.00%
Debt Instrument, Redemption, Period One [Member] \| Senior Notes Due 2024 [Member] \| Repayment From Equity Offering [Member]
Debt Instrument [Line Items]
Redemption price percentage	105.50%
Debt Instrument, Redemption, Period One [Member] \| Senior Notes Due 2024 [Member] \| Repayment From Equity Offering [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption price percentage allowed	40.00%
Debt Instrument, Redemption, Period Two [Member] \| Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Redemption price percentage	103.00%
Debt Instrument, Redemption, Period Two [Member] \| Senior Notes Due 2024 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption price percentage allowed	10.00%
BMCEastLLC [Member] \| Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Equity Method Investment, Ownership Percentage	100.00%
Guarantor Subsidiaries [Member] \| Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Equity Method Investment, Ownership Percentage	100.00%