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Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value [Abstract]

Carrying Values and Fair Values of Debt Instruments

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​	​	​	​	​	​	​	​	​	​	​	​	​	​
​	​	Carrying Value at					​	Fair Value* at					​
​	​	June 30,		​	December 31,		​	June 30,		​	December 31,		​
​		2019			2018			2019			2018
5.25% Senior Notes due 2019	​	$	175,000	​	$	175,000	​	$	176,250	​	$	177,870	​
4.64% Senior Notes due 2021	​	$	100,000	​	$	100,000	​	$	102,936	​	$	101,292	​
2.39% Senior Notes due 2021	​	$	150,000	​	$	150,000	​	$	148,603	​	$	144,305	​
3.09% Senior Notes due 2022	​	$	125,000	​	$	125,000	​	$	125,924	​	$	120,682	​
2.75% Senior Notes due 2023	​	$	200,000	​	$	200,000	​	$	198,899	​	$	188,363	​
3.24% Senior Notes due 2024	​	$	150,000	​	$	150,000	​	$	152,209	​	$	142,877	​
3.41% Senior Notes due 2025	​	$	375,000	​	$	375,000	​	$	384,334	​	$	355,541	​
3.03% Senior Notes due 2026	​	$	400,000	​	$	400,000	​	$	400,776	​	$	367,143	​
3.49% Senior Notes due 2027	​	$	250,000	​	$	250,000	​	$	257,054	​	$	234,243	​
4.25% Senior Notes due 2028	​	$	500,000	​	$	500,000	​	$	548,650	​	$	506,100	​
3.50% Senior Notes due 2029	​	$	500,000	​	$	—	​	$	519,150	​	$	—	​

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*Senior Notes are classified as Level 2 within the fair value hierarchy. Fair value is based on quotes of bonds with similar ratings in similar industries.

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- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- References

No definition available.

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