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Debt Commitments and Contingencies - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |
Cash paid for acquisition |  | $ 23,493,000 | $ 5,575,000 | $ 0
Debt | $ 365,000,000 | 365,000,000 | 90,000,000 |
Apex Industrial Technologies, LLC [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Consideration for assets and transition arrangement | 27,000,000 | $ 27,000,000 |  |
Cash paid for acquisition | $ 12,000,000 |  |  |
Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted per annum interest rate on outstanding line of credit | 1.40% | 1.40% |  |
Credit Facility [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage fee paid for undrawn portion of credit facility |  | 0.10% |  |
Credit Facility [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage fee paid for undrawn portion of credit facility |  | 0.125% |  |
Credit Facility [Member] | LIBOR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest percentage over LIBOR rate |  | 0.95% |  |
Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, maximum borrowing capacity | $ 700,000,000 | $ 700,000,000 |  |
Debt | 350,000,000 | 350,000,000 | 90,000,000 |
Credit Facility [Member] | Letter of Credit Subfacility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, maximum borrowing capacity | 55,000,000 | 55,000,000 |  |
Note [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | $ 15,000,000 | $ 15,000,000 | $ 0 |
Interest rate | 0.56% | 0.56% |  |

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