Related Party Transactions (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) shares	Jun. 30, 2014 USD ($) shares	Jun. 30, 2015 USD ($) item shares	Jun. 30, 2014 USD ($) shares
Chairman and Chief Executive Officer [Member]
Related Party Transaction, Due from (to) Related Party [Abstract]
Number of separate lease agreements | item			2
Lease effective date			Jun. 01, 2014
Aggregate monthly payments under non-cancelable operating lease agreements			$ 0.2
Percentage increase per annum in monthly lease payments under non-cancelable operating lease agreements			3.00%
Lease expense	$ 0.8	$ 0.6	$ 1.6	$ 1.3
O&G [Member]
Related Party Transaction, Due from (to) Related Party [Abstract]
Ownership percentage in joint venture	30.00%		30.00%
Estimated total contract value	$ 362.0		$ 362.0
Expenses for equipment and services	$ 3.2	$ 1.9	$ 5.2	$ 3.4
Number of Company's shares of common stock held by related party joint venture partner (in shares) | shares	500,000	500,000	500,000	500,000
Percentage of common stock held by related party	1.02%	1.03%	1.02%	1.03%