Long-Term Debt (Maturities) (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
2016		$ 48,497
2017		64,634
2018		106,756
2019		127,725
2020		563,751
Thereafter		452,645
Total	[1]	1,364,008
Long-term debt		1,364,008	$ 1,330,563
Acquisition Notes [Member] | Non-interest bearing acquisition note, $5.0 million installment due March 2016
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount		5,000
Long-term debt		$ 4,924	$ 4,623

[1] Includes the acquisition related remaining note payable of $5.0 million, which is non-interest bearing and discounted to $4.9 million as of December 31, 2015.