Segments and Related Information (Reconciliation of EBITDA to Consolidated Income from Continuing Operations) (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Less:
Interest expense, net	$ (12,949,000)	$ (11,838,000)	$ (24,952,000)	$ (21,883,000)
Depreciation and amortization	(36,755,000)	(33,602,000)	(70,249,000)	(65,355,000)
Income from continuing operations before income taxes	51,777,000	57,307,000	77,884,000	88,975,000
Continuing Operations [Member]
Segment Reporting Information [Line Items]
EBITDA	$ 101,500,000	$ 102,700,000	$ 173,100,000	$ 176,200,000

Earnings before interest, taxes, depreciation and amortization, a non-U.S. GAAP financial measure of profitability.

No definition available.

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 5

+ Details

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- Definition

Amount of interest revenue (income derived from investments in debt securities and on cash and cash equivalents) net of interest expense (cost of borrowed funds accounted for as interest).

+ References

No definition available.

+ Details

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