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Depreciation and Amortization (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Depreciation and amortization expense for property and equipment and intangible assets
Total depreciation and amortization expense	$ 5,820	$ 5,228
Operating expenses [Member]
Depreciation and amortization expense for property and equipment and intangible assets
Total depreciation and amortization expense	5,745	5,147
Corporate general and administrative expenses [Member]
Depreciation and amortization expense for property and equipment and intangible assets
Total depreciation and amortization expense	$ 75	$ 81

- Definition

The other noncash expense, not otherwise specified in the taxonomy, charged against earnings in the period to allocate the cost of tangible and intangible assets over their remaining economic lives.

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