Related Party Transactions (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Related Party Transaction, Due from (to) Related Party [Abstract]
Lease expense	$ 0.7	$ 0.6	$ 1.8	$ 1.8
Chairman and Chief Executive Officer [Member]
Related Party Transaction, Due from (to) Related Party [Abstract]
Number of separate lease agreements			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%
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	360		360
Expenses for equipment and services	$ 1.8	$ 1.9	$ 5.1	$ 5.1
Number of Company's shares of common stock held by related party joint venture partner (in shares)	500,000	600,000	500,000	600,000
Percentage of common stock held by related party	1.03%	1.25%	1.03%	1.25%