Employee Benefit Plans - Narrative (Details)	3 Months Ended		6 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($) plan	Dec. 31, 2014 USD ($)	Dec. 31, 2015 plan	Jun. 30, 2015 USD ($)	Jun. 30, 2012 USD ($) quarter	Jan. 05, 2015 USD ($)	Nov. 18, 2014 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
401(k) Plan employer matching contribution	$ 800,000	$ 700,000
Number of non-pension multiemployer plans that the Company participates in	8		8
Minimum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investment horizon period			20 years
Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investment horizon period			30 years
Labor Management Pension Fund [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Withdrawal obligation					$ 4,300,000	$ 4,900,000	$ 4,400,000
Quarterly installment payments on estimated withdrawal liability				$ 91,000	$ 100,000
Number of quarters relating to installment payments on estimated withdrawal liability | quarter					80
Multiemployer Plans, Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of non-pension multiemployer plans that the Company participates in | plan	2		2