Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current taxes [Abstract]
Federal	$ (1,311,000)	$ (1,271,000)	$ 9,388,000
State	741,000	774,000	2,109,000
Foreign	1,693,000	1,754,000	1,707,000
Deferred taxes [Abstract]
Federal	(5,842,000)	4,803,000	2,169,000
State	(1,018,000)	413,000	438,000
Foreign	101,000	249,000	(425,000)
Income tax expense	(5,636,000)	6,722,000	15,386,000
Deferred tax asset [Abstract]
Deferred Tax Asset on Cash Conversion Derivative	3,553,000	0
Accruals and reserves	14,159,000	10,910,000
Deferred compensation	3,933,000	6,597,000
Share-based payments	10,703,000	12,213,000
Net operating loss carryforwards	8,303,000	7,914,000
Other assets and liabilities	1,486,000	1,533,000
Deferred tax assets, Gross	42,137,000	39,167,000
Valuation allowance	(3,630,000)	(3,242,000)
Total	38,507,000	35,925,000
Deferred tax liability [Abstract]
Property and equipment	(44,740,000)	(47,317,000)
Intangible assets	(13,418,000)	(15,700,000)
HWAY Deferred Tax Liability on Cash Convertible Notes Hedges	(3,553,000)	0
Other assets and liabilities	(449,000)	(122,000)
Total	(62,160,000)	(63,139,000)
Net deferred tax liability	(23,653,000)	(27,214,000)
Net current deferred tax asset	9,667,000	8,839,000
Net long-term deferred tax liability	(33,320,000)	(36,053,000)
Tax effect on interest rate swap agreements	972,000	493,000	1,109,000
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration dates	Dec. 31, 2021
Difference between income tax expense computed using statutory federal income tax rate and effective rate [Abstract]
Statutory federal income tax	(4,962,000)	5,161,000	(49,808,000)
Non-deductible goodwill impairment expense	0	0	61,785,000
State income taxes, less federal income tax benefit	(669,000)	453,000	1,520,000
Uncertain tax position reversal	(1,137,000)	0	0
Permanent items	634,000	389,000	434,000
Change in valuation allowance	388,000	285,000	972,000
Prior year tax adjustments	140,000	263,000	150,000
Other	(30,000)	171,000	333,000
Income tax expense	(5,636,000)	6,722,000	15,386,000
Income Tax Contingency [Line Items]
Unrecognized tax benefits that affect our effective tax rate	300,000	1,300,000
Reduction resulting from lapse of applicable statute of Limitations	1,100,000
Changes in unrecognized tax benefits [Roll Forward]
Balance, beginning of period	1,348,000	1,392,000
Decreases based upon tax positions related to prior years		(44,000)
Decreases based upon a lapse of the applicable statute of limitations	(1,060,000)
Balance, end of period	288,000	1,348,000	1,392,000
Undistributed Earnings of Foreign Subsidiaries	10,700,000
International [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	13,900,000
Changes in unrecognized tax benefits [Roll Forward]
Open tax year	2010
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	11,000,000
Changes in unrecognized tax benefits [Roll Forward]
Open tax year	2010
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 17,700,000
Changes in unrecognized tax benefits [Roll Forward]
Open tax year	2010