Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Supplemental Disclosure of Cash Flow Information:
Interest paid	$ 39,570	$ 29,758
Income taxes paid	790	757
Investing Activities:
Accrued capital expenditures	1,833	1,564
Debt and interest rate swaps assumed in acquisitions	0	88,845
Financing Activities:
Dividend distributions declared, but not paid	$ 37,712	$ 34,652