Operating Leases Future Minimum Payments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
2016	$ 42,641,000
2017	33,603,000
2018	25,902,000
2019	18,319,000
2020	9,924,000
Thereafter	14,779,000
Total	145,168,000
Rent expense on operating leases	$ 49,959,000	$ 46,220,000	$ 40,484,000