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Revolving Credit Agreement (Details Textual) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 09, 2016 | Mar. 11, 2016 | Apr. 14, 2015 | Sep. 30, 2012 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 22, 2017 | Oct. 31, 2016 | Oct. 30, 2016 | Oct. 21, 2015 | Sep. 28, 2012
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | $ 400,000 | $ 800,000 |  |  | $ 1,190,000 | $ 1,151,000 | $ 590,000 |  |  |  |  |
Senior unsecured notes payable |  |  |  |  | 573,924,000 | $ 391,254,000 |  |  |  |  |  |
Repayments of borrowings under Credit Agreement |  |  |  |  | $ 120,000,000 |  |  |  |  |  |  |
Repay deficit in agreement Period |  |  |  |  | 6 months |  |  |  |  |  |  |
Borrowings under Credit Agreement |  |  |  |  | $ 0 |  |  |  |  |  |  |
Borrowings interest rate |  |  | 50.00% |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  | 800,000 |  |  |  |  |  |  |
Deferred loan costs |  |  |  |  | 1,300,000 |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | 181,500,000 |  |  |  |  |  |  |  |  |  |  |
Third amended credit agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Company amended and restated its senior secured revolving credit agreement |  |  |  | September 28, 2012 |  |  |  |  |  |  |  |
Senior secured revolving credit maximum facility |  |  |  |  |  |  |  |  | $ 400,000,000 | $ 300,000,000 |  | $ 400,000,000
Maximum borrowing capacity, amended |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
Debt to EBITDA ratio covenant |  |  |  |  | 4.25 |  |  |  |  |  |  |
Percentage of reserves required to maintain |  |  |  |  | 100.00% |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings under Credit Agreement |  |  |  |  |  |  |  | $ 0 |  |  |  |
Outstanding letters of credit |  |  |  |  |  |  |  | $ 800,000 |  |  |  |
LIBOR rate [Member] | Third amended credit agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings interest rate |  |  |  |  | 1.00% |  |  |  |  |  |  |
Maximum [Member] | Third amended credit agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  | 0.50% |  |  |  |  |  |  |
Minimum [Member] | Third amended credit agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  | 0.375% |  |  |  |  |  |  |
Minimum [Member] | Base rate loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Additional interest rate |  |  |  |  | 0.50% |  |  |  |  |  |  |
Eurodollar [Member] | Maximum [Member] | Third amended credit agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Additional interest rate |  |  |  |  | 2.50% |  |  |  |  |  |  |
Eurodollar [Member] | Minimum [Member] | Third amended credit agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Additional interest rate |  |  |  |  | 1.50% |  |  |  |  |  |  |
Unsecured Debt [Member] | Senior Notes Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes payable | $ 175,000,000 |  | $ 400,000,000 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 6.875% |  |  |  |  |  |  |  | 6.875% |
Maturity date |  |  | Apr. 15, 2023 |  |  |  |  |  |  |  |  |
Percentage of principal amount redeemed |  |  | 35.00% |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 5.50% |  |  |  |  |  |  |
Percentage of aggregate principal amount of notes outstanding after redemption |  |  | 65.00% |  |  |  |  |  |  |  |  |
Percentage of principal amount outstanding |  |  | 25.00% |  |  |  |  |  |  |  |  |
Period of default when due of interest |  |  | 30 days |  |  |  |  |  |  |  |  |
Period after notice to comply with reporting obligations |  |  | 180 days |  |  |  |  |  |  |  |  |
Period after notice to comply with agreements in indenture |  |  | 60 days |  |  |  |  |  |  |  |  |
Aggregate principal amount related to payment defaults or accelerations |  |  | $ 25,000,000.0 |  |  |  |  |  |  |  |  |
Amount of failure to pay final judgments |  |  | $ 25,000,000.0 |  |  |  |  |  |  |  |  |
Period for failure to pay final judgments |  |  | 60 days |  |  |  |  |  |  |  |  |
Federal Funds Effective Rate [Member] | Third amended credit agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Borrowings interest rate |  |  |  |  | 0.50% |  |  |  |  |  |  |
Base rate loan [Member] | Maximum [Member] | Third amended credit agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Additional interest rate |  |  |  |  | 1.50% |  |  |  |  |  |  |
Debt Redemption, 2018 [Member] | Unsecured Debt [Member] | Senior Notes Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Redemption Price |  |  | 105.156% |  |  |  |  |  |  |  |  |
Percentage of principal amount redeemed | 105.50% |  | 106.875% |  |  |  |  |  |  |  |  |
Debt Redemption, 2019 [Member] | Unsecured Debt [Member] | Senior Notes Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Redemption Price |  |  | 103.438% |  |  |  |  |  |  |  |  |
Debt Redemption, 2020 [Member] | Unsecured Debt [Member] | Senior Notes Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Redemption Price |  |  | 101.719% |  |  |  |  |  |  |  |  |
Debt Redemption, 2021 and thereafter [Member] | Unsecured Debt [Member] | Senior Notes Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Redemption Price |  |  | 100.00% |  |  |  |  |  |  |  |  |

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- Definition Revolving credit agreement. + References No definition available. + Details
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- Definition Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 + Details
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